已知3x+7y+z=3.15,4x+10y+z=4.2求x+y+z的值 将原方程组整理得2(x+3y)+(x+y+z)=
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已知3x+7y+z=3.15,4x+10y+z=4.2求x+y+z的值 将原方程组整理得2(x+3y)+(x+y+z)=3.15,(1)
3(x+3y)+(x+y+z)=4.2(2) (1)×3,得6(x+3y)+3(x+y+z)=9.45,(3) (2)×2,得6(x+3y)+2(x+y+z)=8.40,(4) (3)-(4),得x+y+z=1.05 仿照上述解法,已知方程组x+y+z=11,x-3y-z=1 试求x+0.5z的值
3(x+3y)+(x+y+z)=4.2(2) (1)×3,得6(x+3y)+3(x+y+z)=9.45,(3) (2)×2,得6(x+3y)+2(x+y+z)=8.40,(4) (3)-(4),得x+y+z=1.05 仿照上述解法,已知方程组x+y+z=11,x-3y-z=1 试求x+0.5z的值
![已知3x+7y+z=3.15,4x+10y+z=4.2求x+y+z的值 将原方程组整理得2(x+3y)+(x+y+z)=](/uploads/image/z/2002878-54-8.jpg?t=%E5%B7%B2%E7%9F%A53x%2B7y%2Bz%3D3.15%2C4x%2B10y%2Bz%3D4.2%E6%B1%82x%2By%2Bz%E7%9A%84%E5%80%BC+%E5%B0%86%E5%8E%9F%E6%96%B9%E7%A8%8B%E7%BB%84%E6%95%B4%E7%90%86%E5%BE%972%EF%BC%88x%2B3y%EF%BC%89%2B%28x%2By%2Bz%29%3D)
已知方程组x+y+z=11,x-3y-z=1
将原方程组整理得(y+0.5z)+(x+0.5z)=11,(1)
-3 (y+0.5z)+(x+0.5z)=1 (2) 【(-3 y-1.5z)+(x+0.5z)=1
(1)×3+(2)
得4(x+0.5z)=12
x+0.5z=3
【关键是把方程转化为要求的x+0.5z】
将原方程组整理得(y+0.5z)+(x+0.5z)=11,(1)
-3 (y+0.5z)+(x+0.5z)=1 (2) 【(-3 y-1.5z)+(x+0.5z)=1
(1)×3+(2)
得4(x+0.5z)=12
x+0.5z=3
【关键是把方程转化为要求的x+0.5z】
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