把9(X-Y)的2次方+12(X的2次方-Y的2次方)+4(X+Y)的2次方分解因式

2024-12-20 19:23:37
推荐回答(1个)
回答1:

9(X-Y)²+12(X²-Y²)+4(X+Y)²
=9x²-18xy+9y²+12x²-12y²+4x²+8xy+4y²
=25x²-10xy+y²
=(5x-y)²