已知-x=3,/y/=4,z+3=0.求xy+yz+xz的值
人气：383 ℃ 时间：2020-04-02 20:24:56
解答
x=-3,z=-3,y=4或-4.
xy+yz+xz=y（x+z）+xz=-6y+9
y=4时,原式=-6*4+9=-15；
y=-4时,原式=-6*（-4）+9=33.
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