Question

已知x的2m次方等于2,求(2x的3m次方)的2次方减(3x的m次方)的2次方

Answer 1

不方便看图的话看这里

X^(2M)=2

[(2X)^(3M)]^2-[(3X)^M]^2

=[(2X)^(6M)]-[(3X)^(2M)]

=[2^(6M)][X^(2M)]^3-[3^(2M)][X^(2M)]

=8[2^(6M)]-2[3^(2M)]

=2^(6M+3)]-2[3^(2M)]

图片清楚一些：

有不明白的可以追问!

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