Question

(1 *2/7 :2 4/7- 2/5 *5/6)+2 2/5 : 2 2/15 помогите плз

Answer 1

(1 * 2/7 : 2 4/7 - 2/5 * 5/6) + 2 2/5 : 2 2/15 = 65/72

1) 1 * 2/7 = 2/7

2) 2/7 : 2 4/7 = 2/7 : 18/7 = 2/7 * 7/18 = 2/18 = 1/9

3) 2/5 * 5/6 = 2/6 = 1/3

4) 1/9 - 1/3 = 2/18 - 6/18 = - 4/18 = - 2/9

5) 2 2/5 : 2 2/15 = 12/5 : 32/15 = 12/5 * 15/32 = (3*3)/(1*8) = 9/8

6) - 2/9 + 9/8 = - 16/72 + 81/72 = 81/72 - 16/72 = 65/72

Ответ: 65/72.