Question

初一下学期数学习题 我要30道关于幂的运算的计算题

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Answer 1

29．(ym)3�6�1yn
60．(-ab)3�6�1(-a2b)�6�1(-a2b4c)2．
61．[(-a)2m]3�6�1a3m+[(-a)5m]2．
62．xn+1(xn-xn-1+x)．
63．(x+y)(x2-xy+y2)．

65．5x(x2+2x+1)-(2x+3)(x-5)．

67．(2x-3)(x+4)．

70．(-2ambn)(-a2bn)(-3ab2)．

74．(m-n)(m5+m4n+m3n2+m2n3+mn4+n5)．
75．(2a2-1)(a-4)(a2+3)(2a-5)．
76．2[(x+2)(x+1)-3]+(x-1)(x-2)-3x(x+3)．
77．(0.3a3b4)2�6�1(-0.2a4b3)3．
78．(-4xy3)�6�1(-xy)+(-3xy2)2．

80．(5a3+2a-a2-3)(2-a+4a2)．
81．(3x4-2x2+x-3)(4x3-x2+5)．

83．(3am+2bn+2)(2am+2am-2bn-2+3bn)．

86．[(-a2b)3]3�6�1(-ab2)．
87．(-2ab2)3�6�1(3a2b-2ab-4b2)．
91．(-2xmyn)3�6�1(-x2yn)�6�1(-3xy2)2．
92．(0.2a-1.5b+1)(0.4a-4b-0.5)．
93．-8(a-b)3�6�13(b-a)．
① (-2×10^3)×( 3×10^4)

② 4a^4 b^2×3a^2 b

③ xy×x^2 y×xy2

④ (-1/2x^2)×(2/3xy^2)

⑤ (-2a^2)×(-ab^2)^3×(2a^2 b^3)

⑥ a^2×(-3ab)×(-5b^2)

一 -2x×(x^2+2x-2)

二 -2a^2×(a^2-3ab+b^2)

三 （1/3x^2-1/2x+3/4）×(-1/2x^2)

四 (4a^3-2a+1) ×(-2a)^2

Ⅰ b(a+b)-a(b-a)

Ⅱ x(x-y)-y(x-y)

Ⅲ a(a^2+a+1)+(-1)(a^2+a+1)

Ⅳ x(x^2-x-1)+2(x^2+1)-1/3x(3x^2+6x)
问题补充：.
① (-2×10^3)×( 3×10^4)
=-6*10^7
② 4a^4 b^2×3a^2 b
=12a^6b^3
③ xy×x^2 y×xy2
=x^4y^4
④ (-1/2x^2)×(2/3xy^2)
=-1/3x^3y^2
⑤ (-2a^2)×(-ab^2)^3×(2a^2 b^3)
=4a^7b^9
⑥ a^2×(-3ab)×(-5b^2)
=15a^3b^3
一 -2x×(x^2+2x-2)
=-2x^3-4x^2+4x
二 -2a^2×(a^2-3ab+b^2)
=-2a^4+6ab-2a^2b^2
三 （1/3x^2-1/2x+3/4）×(-1/2x^2)
=-1/6x^4+1/4x^3-3/8x^2
四 (4a^3-2a+1) ×(-2a)^2
=16a^5-8a^3+4a^2
Ⅰ b(a+b)-a(b-a)
=ab+b^2-ab+a^2
=a^2+b^2
Ⅱ x(x-y)-y(x-y)
=(x-y)^2
Ⅲ a(a^2+a+1)+(-1)(a^2+a+1)
=a^3+a^2+a-a^2-a-1
=a^3-1

Ⅳ x(x^2-x-1)+2(x^2+1)-1/3x(3x^2+6x)
=x^3-x^2-x+2x^2+2-x^3-2x^2
=-x^2-x+2