(x+4)^2(8x-16)=
问题描述：
(x+4)^2(8x-16)=
答
(x+4)²(8x-16)
=(x²+8x+16)(8x-16)
=8x³-16x²+64x²-128x+128x-256
=8x³+48x²-256
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