1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值2 小明和小刚一同解方程组ax+by=26,cx+y=6,小明得x=4,y=-2,小刚把c写错了得解x=7,y=3,求a,b,c的值
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