计算(2x+y)^2(2x--y)^2--4x^2(4x^2--y^2)
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计算(2x+y)^2(2x--y)^2--4x^2(4x^2--y^2)计算(2x+y)^2(2x--y)^2--4x^2(4x^2--y^2)计算(2x+y)^2(2x--y)^2--4x^2(4x
计算(2x+y)^2(2x--y)^2--4x^2(4x^2--y^2)
计算(2x+y)^2(2x--y)^2--4x^2(4x^2--y^2)
计算(2x+y)^2(2x--y)^2--4x^2(4x^2--y^2)
=(2x+y)^2(2x-y)^2-4x^2(2x+y)(2x-y)
=(2x+y)(2x-y)[(2x+y)(2x-y)-4x^2]
=(2x+y)(2x-y)(4x^2-y^2-4x^2)
=-y^2(2x+y)(2x-y)
=-y^2(4x^2-y^2)
=-4x^2y^2+y^4
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