(x-y-3)(x-y+3)怎么做
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(x-y-3)(x-y+3)怎么做
(x-y-3)(x-y+3)怎么做
(x-y-3)(x-y+3)怎么做
=(x-y)2 - 9=x2-2xy+y2-9其中2是平方的意思
=(x-y)²-9
=x²-2xy+y²-9
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