-x=3,/y/=4,z+3=0,求xy+yz+xz的值
人气：408 ℃ 时间：2020-05-26 19:17:50
解答
-x=3,/y/=4,z+3=0,
x=-3 y=±4 z=-3
当y=4时
xy+yz+xz
=-12-12+9
=-24+9
=-15
当y=-4时
xy+yz+xz
=12+12+9
=24+9
=33
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