令X/2=Y/3=Z/4=t
则X=2t,Y=3t,Z=4t
2X+3Y/z
=(2*2t+3*3t)/4t
=13t/4t
=13/4
初二数学分式：若X/2=Y/3=4/Z不等于0.求2X+3Y/z的值
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