2AB²-C
=2(2x²+3xy-y²)(-1/2xy)²-(1/8x³y³-1/4x²y^4)
=2(2x²+3xy-y²)(x²y²)/4-(1/8x³y³-1/4x²y^4)
=x^4y^2+3/2*x^3y^3-1/2*x^2y^4-(1/8x³y³-1/4x²y^4)
=x^4y^2+11/8*x^3y^3-1/4*x^2y^4
如仍有疑惑,歡迎追問.祝：????????????????????????????還可以提取一個x^2y^2/8出來最后是x^2y^2(8x^2+11xy-2y^2)/8至于里面的，系數(shù)是8,11,-2已經(jīng)無法分解了。