一1 .x+z-3=02 .2x-y+2z=23 x-y-z= -3二1.2x+4y+3z=92 3x-2y=5z=11
3个回答
1.x=5,y=4,z=-2(代入再加减)
2.有问题
3.a=-2.4,b=1,c=6.4(加减)
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