问题标题:
一些数学题(ab^2)^3=(3cd)^2=(-2b^2)^3=(-2b)^4=-(3a^2b)^2=------(ab^2)^3=(3cd)^2=(-2b^2)^3=(-2b)^4=-(3a^2b)^2=(-2/3a^2b)^3=[(a-b)^2]^3=[-2(a+b)]^2=(-2*10^3)^3=(x^2)^n*x^m-^n=x^5+x^6=-(4x)^2=16x^2对不?若不对,把正确答案写下
问题描述:
一些数学题(ab^2)^3=(3cd)^2=(-2b^2)^3=(-2b)^4=-(3a^2b)^2=------
(ab^2)^3=
(3cd)^2=
(-2b^2)^3=
(-2b)^4=
-(3a^2b)^2=
(-2/3a^2b)^3=
[(a-b)^2]^3=
[-2(a+b)]^2=
(-2*10^3)^3=
(x^2)^n*x^m-^n=
x^5+x^6=
-(4x)^2=16x^2对不?若不对,把正确答案写下来
牛玉广回答:
(ab^2)^3=a^3a^6
(3cd)^2=9c^2d^2
(-2b^2)^3=-8b^6
(-2b)^4=16b^4
-(3a^2b)^2=-9a^4b^2
(-2/3a^2b)^3=-8/27a^6b^3
[(a-b)^2]^3=(a-b)^6
[-2(a+b)]^2=4(a+b)^2=4a^2+8ab+4b^2
(-2*10^3)^3=-8×10^9
(x^2)^n*x^m-^n=x^(2n)×x^m-^n(-^n这是不是抄少了)
x^5+x^6=x^5(1+x)
-(4x)^2=16x^2不对,负号在括号外,不能进行平方,-(4x)^2=-16x^2
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