若x+y+4z=10,4x+4y+z=15,则x+y+z的值是
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若x+y+4z=10,4x+4y+z=15,则x+y+z的值是
![若x+y+4z=10,4x+4y+z=15,则x+y+z的值是](/uploads/image/z/4408040-56-0.jpg?t=%E8%8B%A5x%2By%2B4z%3D10%2C4x%2B4y%2Bz%3D15%2C%E5%88%99x%2By%2Bz%E7%9A%84%E5%80%BC%E6%98%AF)
x+y+4z=10
4x+4y+z=15
两式相加
5x+5y+5z=25
5(x+y+z)=25
x+y+z=5
不懂的欢迎追问~
4x+4y+z=15
两式相加
5x+5y+5z=25
5(x+y+z)=25
x+y+z=5
不懂的欢迎追问~
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