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X的平方减去Y的平方加上2乘以Y减1
人气:266 ℃ 时间:2020-07-01 19:39:57
解答
x²-y²+2y-1
=x²-(y²-2y+1)
=x²-(y-1)²
=[x+(y-1)][x-(y-1)]
=(x+y-1)(x-y+1)
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