已知x/2=y/4=z/7,求①x:y:z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值.
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已知x/2=y/4=z/7,求①x:y:z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值.
![已知x/2=y/4=z/7,求①x:y:z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值.](/uploads/image/z/8532996-60-6.jpg?t=%E5%B7%B2%E7%9F%A5x%2F2%3Dy%2F4%3Dz%2F7%2C%E6%B1%82%E2%91%A0x%EF%BC%9Ay%EF%BC%9Az.%E2%91%A1%E8%8B%A52x%2By%2B3z%3D58%2C%E5%88%86%E5%88%AB%E6%B1%82x%2Cy%2Cz%E7%9A%84%E5%80%BC.%E2%91%A2%E6%B1%82x%2By%2Fx%2Bz%E7%9A%84%E5%80%BC.)
①令x/2=y/4=z/7=k
所以x=2k,y=4k,z=7k
所以x:y:z=2:4:7
②2x+y+3z=58
即4k+4k+21k=58
29k=58
k=2
x=2k=4
y=4k=8
z=7k=14
③(x+y)/(x+z)
=(2k+4k)/(2k+7k)
=6/9
=2/3
所以x=2k,y=4k,z=7k
所以x:y:z=2:4:7
②2x+y+3z=58
即4k+4k+21k=58
29k=58
k=2
x=2k=4
y=4k=8
z=7k=14
③(x+y)/(x+z)
=(2k+4k)/(2k+7k)
=6/9
=2/3
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