Question

выполните действие а)7/15+7/12;б)7/9-5/12;в)5/21+5/28;11/42-5/28

Answer 1

7/15+7/12=(84+105)/180=189/180=1 1/20

7/9-5/12=(84-40)/108=44/108=11/27

5/21+5/28=(140+105)/588=245/588

11/42-5/28=(22-15)/84=7/84