Question

436. Найдите значения выражений: 2 4 6
2)1/5+3/8–2/9 4)3/4+4/5+1/20 6)4/15+2/5+7/10 ​

Answer 1

Пошаговое объяснение:

1/5 + 3/8 - 2/9 = 72/360 + 135/360 - 80/360 =

(72+135-80)/360 = 127/360

3/4 + 4/5 + 1/20 = 15/20 + 16/20 + 1/20 =

(15+16+1)/20 = 32/20 = 8/5 = 1 3/5

4/15 + 2/5 + 7/10 = 8/30 + 12/30 + 21/30 =

(8+12+21)/30 = 41/30 = 1 11/30