1) x\72-13\72=29\72
x\72=13\72+29\72
x\72=42\72
2) (29\42-a)-13\42=11\42
29\42-a=13\42+11\42
29\42-a=24\42
a=29\42-24\42
a=5\42
76:2=38
38-4=34(это ширина)
38+4=42(это длина)
Сократите обыкновенные дроби (385 - 386) 6/14, 10/22, 12/14, 14/16, 18/28, 20/26, 5/15, 10/35, 6/18, 14/49, 16/40, 100/200
светлана19820412
6/14(:2)=2/7 10/22(:2)=5/11 12/14(:2)=6/7 14/16(:2)=7/8 18/28 (:2)=9/14 20/26 (:2)=10/13 5/15 (:5)=1/3 10/35 (:5)=2/6 6/18 (:3)=2/6 14/49 (:7)=2/7 16/40 (:4)=4/10 100/200 (: 50)=2/4