已知x+y=-4,xy=3,求4(xy+2y)+[6x-(2xy-y-3x)]的值
人气：383 ℃ 时间：2019-09-24 19:30:02
解答
x+y=-4
xy=3
4(xy+2y)+[6x-(2xy-y-3x)]=4(3+2y)+(9x+y-6)=9x+9y+6=9(x+y)+6=-4*9+6=-30
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