上面3个式 首先2式加3式得5x+5z=-5 然后1式加2式乘以2 得出5x+10z=-20把这两式一求得出 x=2 y=5 z=-3 所以xyz=-30
{x+2y+4z=0{2x-y+3z=-10{3x+y+2z=5
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x+y-z=0 2x-3y+2z=5 x+2y-z=3
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{2x+y=10 {x-y+z=4 {3x-y-z=0