4a²(x-y)+b²(y-x)因式分解
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4a²(x-y)+b²(y-x)因式分解
4a²(x-y)+b²(y-x)因式分解
4a²(x-y)+b²(y-x)因式分解
4a²(x-y)+b²(y-x)
=4a²(x-y)-b²(x-y)
=(x-y)(4a²-b²)
=(x-y)(2a+b)(2a-b)