第1个回答 2011-02-05
3.3ab-4ab+8ab-7ab+ab=______.
4.7x-(5x-5y)-y=______.
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
6.-7x2+6x+13x2-4x-5x2=______.
7.2y+(-2y+5)-(3y+2)=______.
11.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
12.2a-(3a-2b+2)+(3a-4b-1)=______.
13.-6x2-7x2+15x2-2x2=______.
14.2x-(x+3y)-(-x-y)-(x-y)=______.
16.2x+2y-[3x-2(x-y)]=______.
17.5-(1-x)-1-(x-1)=______.
18.( )+(4xy+7x2-y2)=10x2-xy.
19.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
21.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______.
22.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______.
23.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
25.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______.
26.-(2x2-y2)-[2y2-(x2+2xy)]=______.
27.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
28.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
29.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
31.3a-(2a-3b)+3(a-2b)-b=______.
32.化简代数式x-[y-2x-(x+y)]等于______.
33.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
34.3x-[y-(2x+y)]=______.
35.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______.
36.已知x≤y,x+y-|x-y|=______.
37.已知x<0,y<0,化简|x+y|-|5-x-y|=______.
38.4a2n-an-(3an-2a2n)=______.
39.若一个多项式加上-3x2y+2x2-3xy-4得
2x2y+3xy2-x2+2xy,
则这个多项式为______.
40.-5xm-xm-(-7xm)+(-3xm)=______.
41.当a=-1,b=-2时,
[a-(b-c)]-[-b-(-c-a)]=______.
43.当a=-1,b=1,c=-1时,
-[b-2(-5a)]-(-3b+5c)=______.
44.-2(3x+z)-(-6x)+(-5y+3z)=______.
45.-5an-an+1-(-7an+1)+(-3an)=______.
46.3a-(2a-4b-6c)+3(-2c+2b)=______.
48.9a2+[7a2-2a-(-a2+3a)]=______.
50.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.
第2个回答 2011-02-05
七年级 有理数计算题
一、 有理数加法
(-9)+(-13) (-12)+27 (-28)+(-34)
67+(-92) (-27.8)+43.9 (-23)+7+(-152)+65
| +(- )| (- )+|― | 38+(-22)+(+62)+(-78)
(-8)+(-10)+2+(-1) (- )+0+(+ )+(- )+(- )
(-8)+47+18+(-27) (-5)+21+(-95)+29
(-8.25)+8.25+(-0.25)+(-5.75)+(-7.5) 6+(-7)+(9)+2
72+65+(-105)+(-28) (-23)+|-63|+|-37|+(-77)
19+(-195)+47 (+18)+(-32)+(-16)+(+26)
(-0.8)+(-1.2)+(-0.6)+(-2.4) (-8)+(-3 )+2+(- )+12
5 +(-5 )+4 +(- ) (-6.37)+(-3 )+6.37+2.75
有理数减法
7-9 ―7―9 0-(-9) (-25)-(-13)
8.2―(―6.3) (-3 )-5 (-12.5)-(-7.5)
(-26)―(-12)―12―18 ―1―(- )―(+ )
(-20)-(+5)-(-5)-(-12) (-23)―(-59)―(-3.5)
|-32|―(-12)―72―(-5) (- )―(- )―
(+ )―(- )―(- )― (- )―3―(-3.2)―7
(+ )―(- )― (+6.1)―(-4.3)―(-2.1)―5.1
(- )―(-1 )―(-1 )―(+1.75) (-3 )―(-2) ―(-1 )―(-1.75)
-8 -5 +4 -3 -4 + +(- )―
0.5+(- )-(-2.75)+ (+4.3)-(-4)+(-2.3)-(+4)
有理数乘法
(-9)× (- )×(-0.26) (-2)×31×(-0.5)
×(-5)+ ×(-13) (-4)×(-10)×0.5×(-3)
(- )× ×(-1.8) (-0.25)×(- )×4×(-7)
(- )×(- )×(- ) (-8)×4×(- )×(-0.75)
4×(-96)×(-0.25)× ( -1 + )×56
( ― ― )×36 (-36)×( + - )
(- )×(8- -0.4) (-66)×〔1 -(- )+(- )〕
25× -(-25)× +25× ( + - + )×72
有理数除法
18÷(-3) (-24)÷6 (-57)÷(-3) (- )÷
(-42)÷(-6) (+ )÷(- ) (- )÷9 0.25÷(- )
-36÷(-1 )÷(- ) (-1)÷(-4)÷ 3÷(- )×(- )
0÷〔(-3 )×(-7)〕 -3÷( - ) (-24 )÷(-6)
2÷(5-18)× 1 ÷(-3)×(- ) - ×(- )÷(- )
( - )÷(- ) ( - + )÷(- ) -3.5 ×( -0.5)× ÷
-1 ÷(-1 )×1 ×(-7) ×(- - )÷
÷(-2 )- × - ÷4 0.8× +4.8×(- )-2.2÷ +0.8×
五、有理数混合运算
(- )×(-15×4) (-2.4)
2÷(- )× ÷(-5 ) 〔15 -(1 ÷1 +3 〕÷(-1 )
×(-5)÷(- )×5 -( - + - )÷(- )
-13× -0.34× + ×(-13)- ×0.34 8-(-25)÷(-5)
(-13)×(-134)× ×(- ) (-4 )-(-5 )+(-4 )-3
(-16-50+3 )÷(-2) (-0.5)-(-3 )+6.75-5
178-87.21+43 +53 -12.79 (-6)×(-4)+(-32)÷(-8)-3
- -(- )+|-1 | (-9)×(-4)+ (-60)÷12
[(- )-1 + ]÷(- ) -|-3|÷10-(-15)×
-1 ×( - )÷2 (2 -3 +1 )÷(-1 )×(-7)
-2× - - - -2× ÷
× + × × × -
+ + - × - - +
0- ÷3× × ÷ - × - ÷
×(- +1) ×0 6+ × -10+8÷ -4×3
- - -(1-0.5)× × ×
第3个回答 2011-01-24
(1)在代数式x+2yz,3a,5x2+4x-1,1,x,mnp,,中有(a )�
(a)4个单项式,2个多项式 (b)5个单项式,3个多项式 (c)7个单项式 (d)8个整式
(2)下列各组单项式中,不是同类项的是( c )�
(a)与x (b)4xy2与-4y2x (c)x5y与x5 (d)4与-4
(3)与a-b互为相反数的是( d )�
(a)a+b (b)a-b (c)-b-a (d)b-a
(4)下列计算中正确的是(d )
(a)5a3-6a3=-a (b)3a2+4a2=7a4 (c)7a+3a2=10a3 (d)a2+4a2=5a2
2.计算.
3ab-4ab+8ab-7ab+ab
=ab
7x-(5x-5y)-y
=2x+4y
23a3bc2-15ab2c+8abc-24a3bc2-8abc
=-36abc
-7x2+6x+13x2-4x-5x2
=4x
2y+(-2y+5)-(3y+2)
=3-ky
第4个回答 2011-01-25
(1) (-8)*(-0.25)*(-0.125)*(-12)*(-0.1)
(2)-17+17/(-1)的17次-5的2次*(-0.2)的3次
答案(1)-3/10
(2) -33.8