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[1+x-y][x+y-1]计算题
人气:189 ℃ 时间:2020-04-11 21:37:49
解答
[1+x-y][x+y-1]
=[x+(y-1)]*[x-(y-1)]
=x²-(y-1)²
=x²- y²+2y - 1
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