1.已知x:y:z=2:3:4 求(x+y)/z 的值和 (2x-y+z)/(x+y+z)
4个回答
1.设X=2,Y=3,Z=4
X+Y=5
(X+Y)/Z=5/4
(2X-Y+Z)/(X+Y+Z)=5/9
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