Question

30道初一上的计算题

Answer 1

1．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______．
2．已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______．
3．若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______．
4．一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______．
5．-(2x2-y2)-[2y2-(x2+2xy)]=______．
6．若-3a3b2与5ax-1by+2是同类项,则x=______,y=______．
7．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______．
8．化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______．
9．2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．
10．3ab-4ab+8ab-7ab+ab=______．
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10道解方程
1.35-24+20-30=1
2.30-20+19+1-29=1
3.10+5-20+1-2=-6
4.58-20-20=18
5.20+3+3+3+5+6+7-2-45=0
6.1+2+3+4+5+6+7+8+9-35=10
7.1-2-3-4-5-6-7-8-9+45=0
8.2+5+5-6=6
9.55-54+5+99-4+2=99
10.35+2-30+5+6=18
三)化简
70．(4x2-8x+5)-(x3+3x2-6x+2)．
72．(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2)．
73．-{2a2b-[3abc-(4ab2-a2b)]｝．
74．(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b)．
75．(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2)．
76．(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4)．
77．(4a-2b-c)-5a-[8b-2c-(a+b)]．
78．(2m-3n)-(3m-2n)+(5n+m)．
79．(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab)．
80．xy-(2xy-3z)+(3xy-4z)．
81．(-3x3+2x2-5x+1)-(5-6x-x2+x3)．
83．3x-(2x-4y-6x)+3(-2z+2y)．
84．(-x2+4+3x4-x3)-(x2+2x-x4-5)．
85．若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B．
86．已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B)．
87．2m-{-3n+[-4m-(3m-n)]｝．
88．5m2n+(-2m2n)+2mn2-(+m2n)．
89．4(x-y+z)-2(x+y-z)-3(-x-y-z)．
90．2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2)．
92．2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2)．
94．4x-2(x-3)-3[x-3(4-2x)+8]．
(四)将下列各式先化简,再求值
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)．