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Виола04

Ответ:

7) 4/25 + 15/4 = 16+375/100 = 391/100 = 3 целых 91/100

8) 27/5*4 = 27/20 = 1 целая 7/20

9) 1 / 1/18-1/21 = 1/ 1/126 = 126

10) 18 * (1/9)^2 - 20 * 1/9= 18 * 1/81 - 20 * 1/9 = 2/9 - 20/9 = - 18/9 = -2

11) 0,9 / 1 + 1/8 = 9/10 делить на 9/8 = 4/5

12) 1/4 + 0,7 = 1/4 + 7/10 = 5+14/20 = 19/20

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