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因式分解16(x+y)²+40(x²-y²)+25(x-y)²
人气:412 ℃ 时间:2020-05-24 03:13:33
解答
答:
16(x+y)²+40(x²-y²)+25(x-y)²
=(4x+4y)²+2×4(x+y)×5(x-y)+(5x-5y)²
=(4x+4y+5x-5y)²
=(9x-y)²
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