3(x+y)-4(x-y)=4 x+2y+3z=5x+y/2+x-y/6=1 2x+3y+6z=95x+3y+9z=15 3(x+y)-4(x-y)=4 x+2y+3z=5 两式一道!(二元一次方程组)x+y/2+x-y/6=1 2x+3y+6z=9 5x+3y+9z=15 (三元一次方程组)
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