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ab(x²+y²)+xy(a²+b²)因式分解
人气:312 ℃ 时间:2019-09-13 19:23:23
解答
ab(x²+y²)+xy(a²+b²)
=abx²+aby²+xya²+xyb²
=ax(bx+ay)+by(ay+xb)
=(ay+bx)(ax+by)
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