25(x+y)的平方-9(x-y)的平方
人气:102 ℃ 时间:2020-05-30 20:16:14
解答
25(x+y)的平方-9(x-y)的平方
=[5(x+y)+3(x-y)][5(x+y)-3(x-y)]
=(8x+2y)(2x+8y)
=4(4x+y)(x+4y)
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