4/9 и 1/6 4/9 = 8/18 и 1/6 = 3/18
9 = 3 * 3 6 = 2 * 3 НОК (9 и 6) = 9 * 2 = 18
1/6 и 2/15 1/6 = 5/30 и 2/15 = 4/30
6 = 2 * 3 15 = 3 * 5 НОК (6 и 15) = 2 * 3 * 5 = 30
5/12 и 7/16 5/12 = 20/48 и 7/16 = 21/48
12 = 2 * 2 * 3 16 = 2 * 2 * 2 * 2 НОК (12 и 16) = 16 * 3 = 48
3/4 и 5/18 3/4 = 27/36 и 5/18 = 10/36
4 = 2 * 2 18 = 2 * 3 * 3 НОК (4 и 18) = 4 * 9 = 36
3/10 и 7/15 3/10 = 9/30 и 7/15 = 14/15
10 = 2 * 5 15 = 3 * 5 НОК (10 и 15) = 2 * 3 * 5 = 30
5/18 и 7/24 5/18 = 20/72 и 7/24 = 21/72
18 = 2 * 3 * 3 24 = 2 * 2 * 2 * 3 НОК (18 и 24) = 8 * 9 = 72
11/30 и 7/24 44/120 и 35/120
30 = 2 * 3 * 5 24 = 2 * 2 * 2 * 3 НОК (30 и 24) = 8 * 3 * 5 = 120
9/34 и 8/51 9/34 = 27/102 и 8/51 = 16/102
34 = 2 * 17 51 = 3 * 17 НОК (34 и 51) = 2 * 3 * 17 = 102
56см * 2 = 112(см) - две длины
2) 2дм 4см = 24 см
24 * 2 = 48(см) - две ширины
3) 112 + 48 = 160(см) = 16дм
ответ: 16 дм - периметр прямоугольника.
Второй
1) 2 * ( 5дм 6см + 2дм 4см) = 2* 8 = 16(дм)
ответ тот же.