6xy+7y+[8x-5xy+y-6x]=6xy+7y+8x-5xy+y-6x=(6xy-5xy)+(7y+y)+(8x-6x)=xy+8y+2x=xy+2(4y+x)=5-2=3
已知x+4y=-1.xy=5,求(6xy+7y)+【(8x-(5xy-y+6x)】
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