因式分解:12(X-Y)-4-9(Y-X)2,用初二知识解决,
问题描述:
因式分解:12(X-Y)-4-9(Y-X)2,用初二知识解决,
答
12(X-Y)-4-9(Y-X)²
=-[9(x-y)²-12(x-y)+4]
=-[3(x-y)-2]²
=-(3x-3y-2)²