9分之5X减4分之3等于4分之1 解：9分之5X=1x=5分之9
5x/9-3/4=1/45x/9=1x=9/5
5x/9-3/4=1/45x/9=15x=9x=9/5
(5X/9)-(3/4)=1/4 5X/9=(3/4)+(1/4) 5X/9=1 5X=9 X=9/5
