3/7*(1/4+7/12) 7/88*(8/21+8/7) плиз народ помогите

Question

3/7*(1/4+7/12) 7/88*(8/21+8/7) плиз народ помогите

Answer 1

3/7*(1/4+7/12)=
1/4+7/12=3/12+7/13=10/12=5/6
3/7*5/6=3*5/7*6=15/42=5/14
Ответ:5/14
7/88*(8/21+8/7)=
8/21+8/7=8/21+24/21=32/21
7/88*32/21=7*32/88*21=4/33