3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y

3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y
3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程
（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y

3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y
原式=(3+8)(x-y)²+(-7+6)(x-y)
=11(x-y)²-(x-y)
原式=(5+3)xy+(-4+4)x²y+(-8-1)xy²
=8xy-9xy²

(2)5xy-4x²y-8xy²+3xy-xy²+4x²y
=8xy-9xy² (化简）
=xy(8-9y)