2/9+7/18=5/18+1/3=17/18-5/9=

Question

2/9+7/18=
5/18+1/3=
17/18-5/9=

Answer 1

2/9+7/18=(2/9*2)+7/18=4/18+7/18=11/18
5/18+1/3=5/18+(1/3*6)=5/18+6/18=11/18
17/18-5/9=17/18-(5/9*2)=17/18-10/18=7/18

Answer 2

2/9+7/18=4/18+7/18=11/18
5/18+1/3=5/18+6/18=11/18
17/18-5/9=7/18
Точно не знаю,но думаю так)