3元1次方程求解已知2x+5y+4z=15,7x+y+3z=14.求4x+y+2z的值

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3元1次方程求解已知2x+5y+4z=15,7x+y+3z=14.求4x+y+2z的值3元1次方程求解已知2x+5y+4z=15,7x+y+3z=14.求4x+y+2z的值3元1次方程求解已知2x+5

3元1次方程求解已知2x+5y+4z=15,7x+y+3z=14.求4x+y+2z的值
3元1次方程求解
已知2x+5y+4z=15,7x+y+3z=14.求4x+y+2z的值

3元1次方程求解已知2x+5y+4z=15,7x+y+3z=14.求4x+y+2z的值
2x+5y+4z=15 <1>
7x+y+3z=14 <2>
<1>+<2>*6得
44x+11y+22z=99
4x+y+2z=9