Question

помогите пожалуй сто с номером 672

Answer 1

2/9+7/18= (2/9)×2+7/18=4/18+718=11/18
5/18+1/3=(1/3)×6+5/18=6/18+5/18=11/18
17/18-5/9=(5/9)×2=10/18=17/18-10/18=7/18