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16(x-y)的平方-9(x+y)的平方=(______)*(________)
人气:293 ℃ 时间:2020-05-26 12:10:34
解答
16(x-y)²-9(x+y)²
=[4(x-y)]²-[3(x+y)]²
=(4x-4y+3x+3y)(4x-4y-3x-3y)
=(7x-y)(x-7y)
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