作业帮x+y=8,x-y=6求x^2-y^2-2x-2y的值
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x+y=8,x-y=6求x^2-y^2-2x-2y的值
x+y=8,x-y=6求x^2-y^2-2x-2y的值
x+y=8,x-y=6求x^2-y^2-2x-2y的值
x+y=8,x-y=6求x^2-y^2-2x-2y的值
x^2-y^2-2x-2y=(x+y)(x-y)-2(x+y)=8*6-2*8=32
32
解: x^2-y^2-2x-2y=(x+y)(x-y)-2(x+y)=8*6-2*8=32
x^2-y^2-2x-2y=(x-y)(x+y)-2(x+y)=8*6-2*8=32
哈哈，此题难住我了！是个好题！
你是个高手。。
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