分组分解法：(ax+bx)²+（bx-ay)²
人气：131 ℃ 时间：2020-02-03 03:28:54
解答
(ax+bx)²+（bx-ay)²
=a²x²+b²y²+b²x²+a²y²
=a²(x²+y²)+b²(x²+y²)
=(x²+y²)(a²+b²)
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