已知x:y=3:5,y:z=2:3,则x+y+z2x-y+z的值为 ___ .
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已知x:y=3:5,y:z=2:3,则
x+y+z |
2x-y+z |
∵x:y=3:5,y:z=2:3,
∴x:y:z=6:10:15;
设x=6k,y=10k,z=15k,
∴
x+y+z
2x-y+z=
6k+10k+15k
12k-10k+15k=
31
17.
∴x:y:z=6:10:15;
设x=6k,y=10k,z=15k,
∴
x+y+z
2x-y+z=
6k+10k+15k
12k-10k+15k=
31
17.
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