首先将X Z 用Y表示 X=3Y/5 Z=3Y/2代入x+y+z/2x-y+z中得(3Y/5 +3Y/2 +Y)/(2×3Y/5 +3Y/2 -Y)=31/17
已知x:y=3:5,y:z=2:3,则[x+y+z/2x-y+z]的值为 ___ .
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