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
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![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](/uploads/image/z/3914048-56-8.jpg?t=3%28x-y%29%26%23178%3B-7%28x-y%29%2B8%28x-y%29%26%23178%3B%2B6%28x-y%29%E6%B1%82%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B%EF%BC%882%EF%BC%89+5xy-4x%26%23178%3By-8xy%26%23178%3B%2B3xy-xy%26%23178%3B%2B4x%26%23178%3By)
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)