作业帮初二积的乘方计算
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初二积的乘方计算
初二积的乘方计算
初二积的乘方计算
1
(3X^2n)^2-4(x^2)^2n
=3^2(x^2n)^2-4(x^2n)^2
=9*7^2-4*7^2
=5*7^2=5*49=245
2
x^2x^2n(y^(n-1))^2
=x^(2n+2)*y^(2n-2)
=(-4)^(2n+2)*(1/4)^(2n-2)
=4^(2n+2)*4^(-2n+2)
=4^(2n+2-2n+2)
=4^4
=256