2x+2y+10z=100 .1x+4y=200 .217x+7y+30z=400.3由1式得x+y+5z=50.43式-4式*6得11x+y=100.55式*4-2式得43x=200x=200/43将x=200/43代入2式得200/43+4y=2004y=8600/43-200/434y=8400/43y=2100/43将x=200/43,y=2100/43代...