7/9-2/9x1/2=7/9-1/9=2/雀轿3您消拍好，答题不易顷桥肆如有帮助请采纳，谢谢
9分之7比9分之改乎2的2分之1多2/37/9-2/9×1/核睁悉2＝7/早亏9-2/18＝14/18-2/18＝12/18＝2/3
7/9—1/2✖️2/9=7/9—1/9=6/9=2/3
7/9-2/9x1/2=7/9-1/9=2/3
7/9-2/9×1/2=7/9-1/9=6/9=2/3
