((5x+2y)(3x+2y)+(x-2y)(x+2y))*4x
=(15x^2+16xy+4y^2+x^2-4y^2)*4x
=(16x^2+16xy)*4x
=64x^2(x+y)
=64*2^2*(2+3)
=1280
((5x+2y)(3x+2y)+(x-2y)(x+2y))*4x 其中x=2 y=3
((5x+2y)(3x+2y)+(x-2y)(x+2y))*4x 其中x=2 y=3
数学人气：144 ℃时间：2020-02-15 13:19:26
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