1)判断题:
100道初中数学计算题多代入下列式子求值1
100道初中数学计算题多代入下列式子求值1
100道初中数学计算题多代入下列式子求值1
判断下列方程是否是一元一次方程:
①-3x-6x2=7( )
③5x+1-2x=3x-2 ( )
④3y-4=2y+1.( )
判断下列方程的解法是否正确:
①解方程3y-4=y+3
3y-y=3+4,2y=7,y=3.5
②解方程:0.4x-3=0.1x+2
0.4x+0.1x=2-3;0.5x=-1,x=-2
③解方程
5x+15-2x-2=10,3x=-3,x=-1;
④解方程
2x-4+5-5x=-1,-3x=-2,x= .( )
2)填空题:
(1)若2(3-a)x-4=5是关于x的一元一次方程,则a≠_
(2)关于x的方程ax=3的解是自然数,则整数a的值为_
(3)方程5x-2(x-1)=17 的解是_
(4)x=2是方程2x-3=m- 的解,则m=_ .
(5)若-2x2-5m+1=0 是关于x的一元一次方程,则m=_ .
(6)当y=_ 时,代数式5y+6与3y-2互为相反数.
(7)当m=_ 时,方程 的解为0.
(8)已知a≠0.则关于x的方程3ab-(a+b)x=(a-b)x的解为______ .
3)选择题:
(1)方程ax=b的解是( ).
A.有一个解x= B.有无数个解
C.没有解 D.当a≠0时,x=
(2)解方程 ( x-1)=3,下列变形中,较简捷的是( )
A.方程两边都乘以4,得3( x-1)=12
B.去括号,得x- =3
C.两边同除以 ,得 x-1=4
D.整理,得
(3)方程2- 去分母得( )
A.2-2(2x-4)=-(x-7) B.12-2(2x-4)=-x-7
C.12-2(2x-4)=-(x-7) D.以上均不对
(4)若代数式 比 大1,则x的值是( ).
A.13 B. C.8 D.
(5)x=1.5是方程( )的解.
A.4x+2=2x-(-2-9)
B.2{3[4(5x-1)-8]-2}=8
C.4x+9 =6x+6
4)解答下列各题:
(1)x等于什么数时,代数式 的值相等?
(2)y等于什么数时,代数式 的值比代数式 的值少3?
(3)当m等于什么数时,代数式2m- 的值与代数式 的值的和等于5?
(4)解下列关于x的方程:
①ax+b=bx+a;(a≠b);
三.化简、化简求值
化间求值:
1、-9(x-2)-y(x-5)
(1)化简整个式子.
(2)当x=5时,求y的解.
2、5(9+a)×b-5(5+b)×a
(1)化简整个式子.
(2)当a=5/7时,求式子的值.
3、62g+62(g+b)-b
(1)化简整个式子.
(2)当g=5/7时,求b的解.
4、3(x+y)-5(4+x)+2y
(1)化简整个式子.
5、(x+y)(x-y)
(1)化简整个式子.
6、2ab+a×a-b
(1)化简整个式子.
7、5.6x+4(x+y)-y
(1)化简整个式子.
8、6.4(x+2.9)-y+2(x-y)
(1)化简整个式子.
9、(2.5+x)(5.2+y)
(1)化简整个式子.
10、9.77x-(5-a)x+2a
(1)化简整个式子.
把x=-2,y=0.1,a=4,b=1代入下列式子求值
3(x+2)-2(x-3)
5(5+a)×b-5(5+b)×a
62a+62(a+b)-b
3(x+y)-5(4+x)+2y
(x+y)(x-y)
2ab+a×a-b
5.6x+4(x+y)-y
6.4(x+2.9)-y+2(x-y)
(2.5+x)(5.2+y)
9.77x-(5-a)x+2a
102×(-4.5)-(-3)×(-5) ÷2
7.8×6.9+2.2×6.9
(-2)+2-(-52)×(-1) ×5+87÷(-3)×(-1)
5.6×0.258×(20-1.25)
(-7.1) ×〔(-3)×(-5)〕÷2
-2.5×(-4.8)×(0.09)÷(-0.27)
127+352+73+44×(-2)
89×276+(-135)-33
25×71+75÷29 -88÷(-2)
243+89+111+57
9405-2940÷28×21
920-1680÷40÷7
690+47×52-398
148+3328÷64-75
360×24÷32+730
2100-94+48×54
51+(2304-2042)×23
4215+(4361-716)÷81
(247+18)×27÷25
36-720÷(360÷18)
1080÷(63-54)×80
(528+2)×5-6178
8528÷41×38-904
264+318-8280÷69
(174+209)×26- (9000^0)
814-(278+322)÷15
1406+735×9÷45
3168-7828÷38+504
796-5040÷(630÷7)
285+(3000-372)÷36
1+5/6-19/12
3x(-9)+7x(-9)
(-54)x1/6x(-1/3)
1.18.1+(3-0.299÷0.23)×1
2.(6.8-6.8×0.55)÷8.5
3.0.12× 4.8÷0.12×4.84
3.2×1.5+2.5÷(-1.6)
(-2)×3.2×(1.5+2.5)÷1.6
5.6-1.6÷4+(6.8-9)
5.38+7.85-5.37÷89
6.7.2÷0.8-1.2×5
6-1.19×3-0.43
7.6.5×(4.8-1.2×4)
0.68×1.9+0.32×1.9
8.10.15-10.75×0.4-5.7
9.5.8×(3.87-0.13)
(-8.01)+4.2×3.74
10.32.52-(6+9.728÷3.2)×2.5
11.[(7.1-5.6)×0.9-1.15] ÷2.5
12.5.4÷[2.6×(3.7-2.9)+0.62]
13.12×6÷(12-7.2)-6
14.12×6÷7.2-6
15.33.02-(148.4-90.85)÷2.5
(-5)-252×(-78)
(-6) ×(-2)+3÷(5+50)
7-7+3-6-(-90)
(-8)(-3)×(-8)×25
(7+13) ÷(-616)÷(-28)
(8+14-100-27)÷4
(-15) ÷(-1)-101÷10
16÷0.21×(-8) ×(4.1+5.9)
(-10) ×(-2) ×4÷{-9÷[6+(-5.67)]}
(-18)(-4)2×[8.01×(-3.14)
9-32{-890-[79+8.1] ×9}
(-20)-23+(-9) ×9.42
(-24)3.4×104÷(-5) ×200.96
[-|98|+76+(-87)]23[56+(-75)-(7)]-(8+4+3)
5+218/2-6-59
68/21-8-118+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4(-0.4)]/1/3+2
22+(-4)+(-2)+43
-28-81/2+8/1/8
(2/3+1/2)/(-1/12)(-12)
(-28)/(-6+4)+(-1) +√9
2/(-2)+0/7-(-8)(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)(-2) ×2^7
(5+3/88/30/(-2)- √36
(-84)/2(-3)/(-6)
1/2(-4/15)/2/3
1+2+3+4+......+100000
1/1+1/2+1/3+......1/50
1+1/2+1/4+1/8+1/16+......1/512
3+9+27+81+243+......9999
1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
8-2×32-(-2×3)2
–12 × (-3)2-(-1/2)2003×(-2)2002÷2/9
(0.5-3/2)÷3/1×[-2-(-3)3]-∣1/8-0.52∣
[-38-(-1)7+(-3)8]×-53
a^3-2b^3+ab(2a-b)-√a-b^2
15(-8)+2b^2+
(x^2+y^2)^2-4y(x^2+y^2)+4y^2
6-3a^8-(-5^2-6)
(x^2+2x)^2+3(x^2+2x)+x^2+2x+3
(a+1)(a+2)+(2a+1)(a-2)-12
x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2
3(a+2)^2+28(a+2)-20
(a+b)^2-(b-c)^2+a^2-c^2
8x(x+1)(x^2+x-1)-2
x^2(x-1)^2-3(x^2-x)-56
14a(a-b)+(a-b)^2
11.-ab(a-b)^+a(b-a)^2
12.3(x+2)-2x=5-4x
13.5(x+2a)-a=2(b-2x)+4a
3.143.42 (2)9.141/4
[-|98|+76+(-87)]23[56+(-75)-(7)]-(8+4+3)
5+218/2-√121-59
68/21-8-118+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4(-0.4)]/1/3+2
22+(-4)+(-2)+43
-28-81/2+8/1/8
(2/3+1/2)/(-1/12)(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)(|-2|-5^4)
(1/3+2/3)/1/2-|-9+(-5)|
18-6/(-3)(-2)-|-9|
(5+3/88/30/(-2)-3
(-84)/2(-3)/(-6)
1/2(-4/15)/2/3
|-3x+2y-5x-7y|-|-9x+2y|
-5+218/2-6-59
68/21-8-118+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4(-0.4)]/1/3+2
22+(-4)+(-2)+43-√64-5^2
-28-81/2+8/1/8
(2/3+1/2)/(-1/12)(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)(-2)
(5+3/88/30/(-2)-3
(-84)/2(-3)/(-6)
1/2(-4/15)/2/3+√9
-3x+2y-5x-7y+
-5+218/2-6-59
68/21-8-118+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4(-0.4)]/1/3+2
22+(-4)+(-2)+43
-28-81/2+8/1/8
(2/3+1/2)/(-1/12)(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)(-2)
(5+3/88/30/(-2)-3
(-84)/2(-3)/(-6)
1/2(-4/15)/2/3
-3x+2y-5x-7y-(-3^2+5^7)
-1+2-3+4-5+6-7+√9
-50-28+(-24)-(-22)
-19.8-(-20.3)-(+20.2)-10.8;
0.25- +(-1 )-(+3 ).
-1-23.33-(+76.76)
1-2222-5^2+(6^2-5^2)
(-6-24.3)-(-12+9.1)+(0-2.1)
-1+8-7+5^7-(-5+√9)
1253+1255+253+25
99993+10111(101-92)
(23/4-3/4)(36+2)
3/7 × 49/9 - 4/3
8/9 × 15/36 + 1/27
12x5/6y–2/9y|3x-2y|
8×5/4+1/4|-7-8|
6÷ 3/8 – 3/8 ÷6
4/7 × 5/9 + 3/7 × 5/9
5/2 -( 3/2 + 4/5 )
7/8 + ( 1/8 + 1/9 )
9 × 5/6 + 5/6
3/4 × 8/9 - 1/3
7 × 5/49 + 3/14
6 ×( 1/2 + 2/3 )
8 × 4/5 + 8 × 11/5
31 × 5/6 – 5/6
9/7 - ( 2/7 – 10/21 )
5/9 × 18 – 14 × 2/7
4/5 × 25/16 + 2/3 × 3/4
14 × 8/7 – 5/6 × 12/15
17/32 – 3/4 × 9/24
3^45 × 2/9 + 1/3
5/7 × 3/25 + 3/7
3/14 ×2/3 + 1/6
1/5 × 2/3 + 5/6
5/3 × 11/5 + 4/3
9/22+1/11÷1/2-√169
45^8 × 2/3 + 1/3 × 15
7/19 + 12/19 × 5/6
1/4 + 3/4 ÷ 2/3
8/7 × 21/16 + 1/2
101^4×(-1/5–1/5×21)
50+√160÷40^5
120-144÷18+35
347+45×2-4160÷52
37^2(58+37)÷(64-9×5)
95÷(64-45)
178-145÷5×6+42
812-700÷(9+31×11)
85+14×(14+208÷26)
120-36×4÷18+35
(58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8
(3.2×1.5+2.5)÷1.6
6-1.6÷4= 5.38+7.85-5.37=
7.2÷0.8-1.2×5= 6-1.19×3-0.43=
6.5×(4.8-1.2×4)=
5.8×(3.87-0.13)+4.2×3.74
32.52-(6+9.728÷3.2)×2.5
[(7.1-5.6)×0.9-1.15] ÷2.5
5.4÷[2.6×(3.7-2.9)+0.62]
12×6÷(12-7.2)-6
12×6÷7.2-6
0.68×1.9+0.32×1.9
58+370)÷(64-45)
420+580-64×21÷28
136+6×(65-345÷23)
15-10.75×0.4-5.7
18.1+(3-0.299÷0.23)×1
(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8
(3.2×1.5+2.5)÷1.6
3.2×6+(1.5+2.5)÷1.6
0.68×1.9+0.32×1.9
10.15-10.75×0.4-5.7
5.8×(3.87-0.13)+4.2×3.74
32.52-(6+9.728÷3.2)×2.5
[(7.1-5.6)×0.9-1.15] ÷2.5
5.4÷[2.6×(3.7-2.9)+0.62]
12×6÷(12-7.2)-6
12×6÷7.2-6
33.02-(148.4-90.85)÷2.5
76.(25%-695%-12%)36
7/43/5+3/42/5
1-1/4+8/9/7/9
7+1/6/3/24+2/21
8/153/5
3/4/9/10-1/6
8/3+1/2)/5/6-1/3]/1/7
9/5+3/5/2+3/4
8^6(2-2/3/1/2)]2/5
8+5268.32-2569
3+456-528
87.5%+6325
8/2+1/3+1/4
89+456-78
5%+. 3/7 × 49/9 - 4/3
9 × 15/36 + 1/27
2× 5/6 – 2/9 ×3
3× 5/4 + 1/4
94÷ 3/8 – 3/8 ÷6
95/7 × 5/9 + 3/7 × 5/9
6/2 -( 3/2 + 4/5 )
8 + ( 1/8 + 1/9 )
8 × 5/6 + 5/6
1/4 × 8/9 - 1/3
10× 5/49 + 3/14
1.5 ×( 1/2 + 2/3 )
2/9 × 4/5 + 8 × 11/5
3.1 × 5/6 – 5/6
4/7 - ( 2/7 – 10/21 )
19 × 18 – 14 × 2/7
5 × 25/16 + 2/3 × 3/4
4 × 8/7 – 5/6 × 12/15
7/32 – 3/4 × 9/24
2/3÷1/2-1/4×2/5
2-6/13÷9/26-2/3
2/9+1/2÷4/5+3/8
10÷5/9+1/6×4
1/2×2/5+9/10÷9/20
5/9×3/10+2/7÷2/5
1/2+1/4×4/5-1/8
3/4×5/7×4/3-1/2
23-8/9×1/27÷1/27
18×5/6+2/5÷4
11/2+3/4×5/12×4/5
8/9×3/4-3/8÷3/4
5/8÷5/4+3/23÷9/11
1.2×2.5+0.8×2.5
8.9×1.25-0.9×1.25
12.5×7.4×0.8
9.9×6.4-(2.5+0.24)
6.5×9.5+6.5×0.5
0.35×1.6+0.35×3.4
0.25×8.6×4
6.72-3.28-1.72
0.45+6.37+4.55
5.4+6.9×3-(25-2.5)
2×41846-620-380
4.8×46+4.8×54
0.8+0.8×2.5
1.25×3.6×8×2.5-12.5×2.4
28×12.5-12.5×20
23.65-(3.07+3.65)
(4+0.4×0.25)8×7×1.25
1.65×99+1.65
27.85-(7.85+3.4)
48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
(1010+309+4+681+6)×12
3×46×782×6×854
5.15×7/8+6.1-0.60625
3/7 × 49/9 - 4/3
8/9 × 15/36 + 1/27
12× 5/6 – 2/9 ×3
8× 5/4 + 1/4
6÷ 3/8 – 3/8 ÷6
4/7 × 5/9 + 3/7 × 5/9
5/2 -( 3/2 + 4/5 )
7/8 + ( 1/8 + 1/9 )
9 × 5/6 + 5/6
3/4 × 8/9 - 1/3
7 × 5/49 + 3/14
6 ×( 1/2 + 2/3 )
8 × 4/5 + 8 × 11/5
31 × 5/6 – 5/6
9/7 - ( 2/7 – 10/21 )
5/9 × 18 – 14 × 2/7
4/5 × 25/16 + 2/3 × 3/4
14 × 8/7 – 5/6 × 12/15
17/32 – 3/4 × 9/24
3 × 2/9 + 1/3
5/7 × 3/25 + 3/7
3/14 × 2/3 + 1/6
1/5 × 2/3 + 5/6
9/22 + 1/11 ÷ 1/2
5/3 × 11/5 + 4/3
45 × 2/3 + 1/3 × 15
7/19 + 12/19 × 5/6
1/4 + 3/4 ÷ 2/3
8/7 × 21/16 + 1/2
101 × 1/5 – 1/5 × 21
50+160÷40 (58+370)÷(64-45)
120-144÷18+35
347+45×2-4160÷52
(58+37)÷(64-9×5)
95÷(64-45)
178-145÷5×6+42 420+580-64×21÷28
812-700÷(9+31×11)
(136+64)×(65-345÷23)
85+14×(14+208÷26)
(284+16)×(512-8208÷18)
120-36×4÷18+35
(58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8
(3.2×1.5+2.5)÷1.6
3.2×(1.5+2.5)÷1.6
6-1.6÷4= 5.38+7.85-5.37=
7.2÷0.8-1.2×5= 6-1.19×3-0.43=
6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
10.15-10.75×0.4-5.7
5.8×(3.87-0.13)+4.2×3.74
32.52-(6+9.728÷3.2)×2.5
[(7.1-5.6)×0.9-1.15] ÷2.5
5.4÷[2.6×(3.7-2.9)+0.62]
12×6÷(12-7.2)-6 (4)12×6÷7.2-6
102^2×4.5+8^5-√529
7.8×6.9+2.2×6.9
5.6×0.25
8×(20-1.25)
127+352+73+44
89+276+135+33
25+71+75+29 +88
243+89+111+57
9405-2940÷28×21
920-1680÷40÷7
690+47×52-398
148+3328÷64-75
360×24÷32+730
2100-94+48×54
51+(2304-2042)×23
4215+(4361-716)÷81
(247+18)×27÷25
36-720÷(360÷18)
1080÷(63-54)×80
(528+2)×5-6178
8528÷41×38-904
264+318-8280÷69
(174+209)×26- 9000
814-(278+322)÷15
1406+735×9÷45
3168-7828÷38+504
796-5040÷(630÷7)
285+(3000-372)÷36
1+5/6-19/12
3x(-9)+7x(-9
(-54)x1/6x(-1/3)
18.1+(3-0.299÷0.23)×1
(6.8-6.8×0.55)÷8.5
0.12× 4.8÷0.12×4.8
(3.2×1.5+2.5)÷1.6
3.2×(1.5+2.5)÷1.6
5.6-1.6÷4
5.38+7.85-5.37
7.2÷0.8-1.2×5
6-1.19×3-0.43
6.5×(4.8-1.2×4)
0.68×1.9+0.32×1.9
115-10.75×0.4-5.7
5.8×(3.87-0.13)+4.2×3.74
32.52-(6+9.728÷3.2)×2.5
[(7.1-5.6)×0.9-1.15] ÷2.5
5.4÷[2.6×(3.7-2.9)+0.62]
12×6÷(12-7.2)-6
12×6÷7.2-6
33.02-(148.4-90.85)÷2.5
二.解方程
2x=7(x-5)
8(3x+3)=240
4.74+4x-2.5x=8.1
(2.81+x)÷2.81=1
15x-30=16(x-2)
(-3)^3-3^3
(-1)^2-5.6
2^2+3^3-4^4
(2^4-3^2)^3-5^5
[(1.6^2-2^3)-2.1]^2
(5.66×2)^2-15^2
(-15)^x=225,x=?
[(-4)^2-4^2]×2^2
[(-5.6)^2+3]^2
[5.6^2+(-5.6)^2]×(-1)^2
3x+28-x=56
1.5x+6=3.75
2(3.6x+2.8)=-1.6
9.5x+9.5=19
18(x-35)=-36
x+7-(-36+8^2)/2=8+7^4/3
a-7-98+7a=3.25a
89/2+35/6x=39+2^3/5+7x
3X+189/3=521/2
4Y+119^3=22/11
3X189=54^5/3
8Z/6=458/5
3X+77=59
4Y-6985=81
87X13=5
7Z/93=41
15X+863-65X=54
58Y55=27489
7(2x-1)-3(4x-1)=4(3x+2)-1
(5y+1)+ (1-y)= (9y+1)+ (1-3y)
[-6(-7^48)-4]=x+2
20%+(1-20%)(320-x)=320×40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
2x+7^2=157
给我邮箱,我给你各市中考的计算题。有
我发给你
这个嘛....
一、解方程:
(1)6x=3x-12 (2)2y― = y―3
(3)-2x=-3x+8 (4)56=3x+32-2x
(5)3x―7+6x=4x―8 (6)7.9x+1.58+x=7.9x-8.42
(7)3(2x+5)=2(4x+3)-3 (8)4y﹣3(20﹣y)=6y﹣7(9﹣y)
(9)7(2x-1)-3(4x-1)=4(3x+2)-1 (10)(5y+1)+ (1-y)= (9y+1)+ (1-3y)
(11) 2(x-2)+2=x+1 (12) 2(x-2)-3(4x-1)=9(1-x)
(13) 11x+64-2x=100-9x (14) 15-(8-5x)=7x+(4-3x)
(15) 3(x-7)-2[9-4(2-x)]=22 (16) 12x-10.3x=15
(17) 20.52x-(1-0.52)x=80 (18) 43x+7=32-2x
(19) 53x+5(138-x)=540 (20) 63x-7(x-1)=3-2(x+3)
设出席晚宴共有X人,则X(X-1)/2=990,解得X1=45 X2=-44(舍)
所以出席晚宴的人共有45人
2.等腰三角形的腰长为5,可知底边为8,可求面积为12,设矩形的一边为X,则另一边为9-X,所以X(9-X)=12,可解得回答即可得2分经验值,回答被采纳可同步增加经验值和财富值
初一数学计算题大全及【同步达纲练习】
1.选择题:
(1)把-2-(+3)-(-5)+(-4)+(+3)写成省略括号和的形式,正确的是( )
A.-2-3-5-4+3 B.-2+3+5-4+3 C.-2-3+5-4+3 D.-2-3-5+4+3
(2)计算(-5)-(+3)+(-9)-(-7)+ 所得结果正确的是( )
A.-10 B.-9 C.8 D.-23
(3)-7,-12,+2的代数和比它们的的和小( )
A.-38 B.-4 C.4 D.38
(4)若 +(b+3)2=0,则b-a- 的值是( )
A.-4 B.-2 C.-1 D.1
(5)下列说确的是( )
A.两个负数相减,等于相减 B.两个负数的一定大于零 C.正数减去负数,实际是两个正数的代数和 D.负数减去正数,等于负数加上正数的
(6)算式-3-5不能读作( )
A.-3与5的 B.-3与-5的和 C.-3与-5的 D.-3减去5
2.填空题:(4′×4=16′)
(1)-4+7-9=- - + ;
(2)6-11+4+2=- + - + ;
(3)(-5)+(+8)-(+2)-(-3)= + - + ;
(4)5-(-3 )-(+7)-2 =5+ - - + - .
3.把下列各式写成省略括号的和的形式,并说出它们的两种读法:(8′×2=16′)
(1)(-21)+(+16)-(-13)-(+7)+(-6);
(2)-2 -(- )+(-0.5)+(+2)-(+ )-2.
4.计算题(6′×4=24′)
(1)-1+2-3+4-5+6-7;
(2)-50-28+(-24)-(-22);
(3)-19.8-(-20.3)-(+20.2)-10.8;
(4)0.25- +(-1 )-(+3 ).
5.当x=-3.7,y=-1.8,z=-1.5时,求下列代数式的值(5′×4=20′)
(1)x+y-z;
(2)-x-y+z;
(3)-x+y+z;
(4)x-y-z.
初一数学计算题大全及【素质优化训练】
(1) (-7)-(+5)+(+3)-(-9)=-7 5 3 9;
(2)-(+2 )-(-1 )-(+3 )+(- ) =( 2 )+( 1 )+( 3 )+( );
(3)-14 5 (-3)=-12;
(4)-12 (-7) (-5) (-6)=-16;
(5)b-a-(+c)+(-d)= a b c d;
2.当x= ,y=- ,z=- 时,分别求出下列代数式的值;
(1)x-(-y)+(-z);
(2)x+(-y)-(+z);
(3)-(-x)-y+z;
(4)-x-(-y)+z.
3.就下列给的三组数,验证等式: a-(b-c+d)=a-b+c-d是否成立.
(1)a=-2,b=-1,c=3,d=5; (2)a=23 ,b=-8,c=-1 ,d=1 .
4.计算题
(1)-1-23.33-(+76.76);
(2)1-2222;
(3)(-6-24.3)-(-12+9.1)+(0-2.1);
(4)-1+8-7
参:
【同步达纲练习】
1.(1)C;(2)B;(3)D;(4)A;(5)C;(6)C 2.(1)4,(-7),(-9) (2)(-6),(-11),(-4),2; (3)-5,8,2,3; (4)3,7,2; 3.略4.(1)-4; (2)-80; (3)-30.5 (4)-5 5.(1)-4; (2)4; (3)0.4; (4)-0.4.
【素质优化训练】 1.(1)-,+,+; (2)-,+,-,-; (3)+,+; (4)-,+,+; (5)-,+,-,-. 2.(1) (2) (3) (4)- 3.(1) (2)都成立. 4.(1)- (2) (3)-29.5 (4)-1 第(4)题注意同号的数、互为相反数先分别结合。
带“”的均为次方。
晕哦,你不会去买一本数来做练习吗?这样有在下面的题目多多少少会阻碍我们的思维方式,所以我劝你去买本书来做吧,这样会好些的,效果也很好的
15: 解:(1)抛物线与x轴的交点的坐标为(-5,0)和(1,0);
抛物线与y轴的交点的坐标为(0,-5);
(2)y=x2+4x-5,
=(x2+4x+4)-9,
=(x+2)2-9.
①与x轴交点是(一5,0),(1,0)
与y轴交点:(0,一5)
②y=(x十2)^2一9
采纳哦
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