已知x+2y+3z=54,3x+2y+2z=47,2x+y+z=31,求代数式x+y+z的值
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![已知x+2y+3z=54,3x+2y+2z=47,2x+y+z=31,求代数式x+y+z的值](/uploads/image/z/469149-69-9.jpg?t=%E5%B7%B2%E7%9F%A5x%2B2y%2B3z%3D54%2C3x%2B2y%2B2z%3D47%2C2x%2By%2Bz%3D31%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8Fx%2By%2Bz%E7%9A%84%E5%80%BC)
已知x+2y+3z=54,3x+2y+2z=47,2x+y+z=31,求代数式x+y+z的值
已知x+2y+3z=54,3x+2y+2z=47,2x+y+z=31,求代数式x+y+z的值
已知x+2y+3z=54,3x+2y+2z=47,2x+y+z=31,求代数式x+y+z的值
不会是解方程那么复杂,请确定下第三个式子y的系数是1还是2
如果是2的话,三式相加你就看出来了
将三个式子左右同时相加得6x+6y+6z=132
得x+y+z=132/6=22
x+2y+3z=54 1
3x+2y+2z=47 2
2x+y+z=31 3
2-3,x+y+z=16