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化简求值:(x2+y2)(x2-y2)-(x+y)2(x-y)2,其中x=4,y=1.
题目详情
化简求值:(x2+y2)(x2-y2)-(x+y)2(x-y)2,其中x=4,y=1.
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答案和解析
原式=x4-y4-[(x+y)(x-y)]2=x4-y4-(x2-y2)2
=x4-y4-(x4-2x2y2+y4)
=x4-y4-x4+2x2y2-y4=2x2y2-2y4
把x=4,y=1代入
原式=2×42×12-2×14=30.
=x4-y4-(x4-2x2y2+y4)
=x4-y4-x4+2x2y2-y4=2x2y2-2y4
把x=4,y=1代入
原式=2×42×12-2×14=30.
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