-3(x2-xy)-x(-2y+2x) ⑵ (-x5)•x3n-1+x3n•(-x)4
2. (x+2)(y+3)-(x+1)(y-2) ⑷ (-2m2n)3•mn+(-7m7n12)0-2(mn)-4•m11•n8
3. (5x2y3-4x3y2+6x)÷6x,其中x=-2,y=2 ⑹ (3mn+1)(3mn-1)-(3mn-2)2
4. 9992-1 ⑻ 20032
5. -2.5×(-4.8)×(0.09)÷(-0.27)
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)＝______．
8．(2x2-3xy+4y2)+(x2+2xy-3y2)=______．
9．2a-(3a-2b+2)+(3a-4b-1)=______．
10．-6x2-7x2+15x2-2x2＝______．
11．2x-(x+3y)-(-x-y)-(x-y)＝______．
12．2x+2y-[3x-2(x-y)]=______．
13．5-(1-x)-1-(x-1)=______．
14．( )+(4xy+7x2-y2)=10x2-xy．
15．(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3．
16．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______．
17．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______．
18．若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______．
19．一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______．
20．-(2x2-y2)-[2y2-(x2+2xy)]=______．
21．若-3a3b2与5ax-1by+2是同类项,则x=______,y=______．
22．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______．
23．化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______．
24．2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．
25．3a-(2a-3b)+3(a-2b)-b=______．
26．化简代数式x-[y-2x-(x+y)]等于______．
27．[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1．
28．3x-[y-(2x+y)]=______．
29．化简|1-x+y|-|x-y|(其中x＜0,y＞0)等于______．
30．已知x≤y,x+y-|x-y|=______．
31．已知x＜0,y＜0,化简|x+y|-|5-x-y|=______．
32．4a2n-an-(3an-2a2n)＝______．
33．若一个多项式加上-3x2y+2x2-3xy-4得 2x2y+3xy2-x2+2xy, 则这个多项式为______．
34．-5xm-xm-(-7xm)+(-3xm)=______．
35．当a=-1,b=-2时, [a-(b-c)]-[-b-(-c-a)]＝______．
36．当a=-1,b=1,c=-1时, -[b-2(-5a)]-(-3b+5c)＝______．
37．-2(3x+z)-(-6x)+(-5y+3z)=______．
38．-5an-an+1-(-7an+1)+(-3an)＝______．
39．3a-(2a-4b-6c)+3(-2c+2b)=______．
40．9a2+[7a2-2a-(-a2+3a)]=______．
41．当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______．
97．已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值．
98．已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C．
99．求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2．
101．已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值．
106．当P=a2+2ab+b2,Q=a2-2ab-b2时,求P-[Q-2P-(P-Q)]．
107．求2x2-｛-3x+5+[4x2-(3x2-x-1)]｝的值,其中x=-3．
110．当x=-2,y=-1,z=3时,求5xyz-｛2x2y-[3xyz-(4xy2-x2y)]｝的值．
113．已知A=x3-5x2,B=x2-6x+3,求A-3(-2B)．
115．去括号：｛-[-(a+b)]｝-｛-[-(a-b)]｝．
116．去括号：-[-(-x)-y]-[+(-y)-(+x)]．
117．已知A=x3+6x-9,B=-x3-2x2+4x-6,计算2A-3B,并把结果放在前面带“-”号的括号内．
118．计算下式,并把结果放在前面带“-”号的括号内：
（-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y)．
119．去括号、合并同类项,将结果按x的升幂排列,并把后三项放在带有“-”号的括号内：
120．不改变下式的值,将其中各括号前的符号都变成相反的符号：(x3+3x2)-(3x2y-7xy)+(2y3-3y2)．
121．把多项式4x2y-2xy2+4xy+6-x2y2+x3-y2的三次项放在前面带有“-”号的括号内,二次项放在前面带有“+”号的括号内,四次项和常数项放在前面带有“-”号的括号内．
122．把下列多项式的括号去掉,合并同类项,并将其各项放在前面带有“-”号的括号内,再求2x-2[3x-(5x2-2x+1)]-4x2的值,其中x=-1．
123．合并同类项： 7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y．
124．合并同类项：5m2n+5mn2-mn+3m2n-6mn2-8mn．
126．去括号,合并同类项：
(1)(m+1)-(-n+m)；
(2)4m-[5m-(2m-1)]．
127．化简：2x2-｛-3x-[4x2-(3x2-x)+(x-x2)]｝．
128．化简：-(7x-y-2z)-｛[4x-(x-y-z)-3x+z]-x｝．
129．计算：(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a)．
130．化简：a3-(a2-a)+(a2-a+1)-(1-a4+a3)．
131．将x2-8x+2x3-13x2-2x-2x3+3先合并同类项,再求值,其中x=-4．
132．在括号内填上适当的项：[( )-9y+( )]+2y2+3y-4=11y2-( )+13．
133．在括号内填上适当的项： (-x+y+z)(x+y-z)=[y-( )][y+( )]．
134．在括号内填上适当的项：
3x2+xy-7y2)-( )=y2-2xy-x2．
135．在括号内填上适当的项：
(1)x2-xy+y-1=x2-( )；
(2)[( )+6x-7]-[4x2+( )-( )]=x2-2x+1．
136．计算4x2-3[x+4(1-x)-x2]-2(4x2-1)的值．
138．用竖式计算 (-x+5+2x4-6x3)-(3x4+2x2-3x3-7)．
139．已知A=11x3+8x2-6x+2,B=7x3-x2+x+3,求2(3A-2B)．
140．已知A=x3-5x2,B=x3-11x+6,C=4x-3,求
(1)A-B-C；
(2)(A-B-C)-(A-B+C)．
141．已知A=3x2-4x3,B=x3-5x2+2,计算
(1)A+B；
(2)B-A．
142．已知x＜-4,化简|-x|+|x+4|-|x-4|．
146．求两代数式-1.56a+3.2a3-0.47,2.27a3-0.02a2+4.03a+0.53的差与6-0.15a+3.24a2+5.07a3的和．
150．已知(x-3)2+|y+1|+z2=0,求x2-2xy-5x2+12xz+3xy-z2-8xz-2x2的值．复制的,希望能帮助你