解方程组: 5x+3y=25 2x+7y-3z=19 3x+2y-z=18
2个回答
先从2,3式消掉z,得到7x-y=35再与1式结合,得x=5,y=0,z=-3
1.设甲乙速度为想x,y
2(x+y)=42
14(y-x)=42
x=9
y=12
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