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(-x-y)(x+y)和(-x-y)(x-y)的答案,最好是用完全平方差的公式.今天就要啊!
人气:148 ℃ 时间:2020-05-30 10:13:25
解答
(-x-y)(x+y)
=-(x+y)²
=-x²-2xy-y²
(-x-y)(x-y)
=(-y-x)(-y+x)
=(-y)²-x²
=y²-x²
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