Вычислите: 2\5/7\10+2 1\3*2\7=

Question

Вычислите: 2\5/7\10+2 1\3*2\7=

Comments

2/5/7\10+2 1\3*2\7= (2/5)/(7/10)+(21/3)*(2/7)=((2*10)/(5*7))+((21*2)/(3*7))=(4/7) + 2

Answer 1

2/5 : 7/10 + 2 1/3 · 2/7 = 1 5/21

1) 2/5 : 7/10 = 2/5 · 10/7 = (2·2)/(1·7) = 4/7

2) 2 1/3 · 2/7 = 7/3 · 2/7 = 2/3

3) 4/7 + 2/3 = 12/21 + 14/21 = 26/21 = 1 5/21

Ответ: 1 целая 5/21.