Question

Помогите ПОЖАЛУЙСТА ,очень сроно

Answer 1

1. 1) y / 51.6 = 11.2 / 34.4;
y = 51.6 * 11.2 / 34.4 = 16.8

2) (в неправильный дробь) 3 1/5 = 16/5, 4 1/2 = 9/4, 2 1/4 = 9/4;
(двойная дробь) y / 16/5 = 9/4 / 9/4; y = 16/5 * 9/4 / 9/4 = 16/5 = 3.2

3) (сразу в десятичную дробь) 1/2 = 0.5, 5/2 = 2.5;
0.2 / x-2 = 0.5 / 2.5; x-2 = 0.2 * 2.5 / 0.5 = 1; x = 2 + 1; x = 3

2. 1) - 6 - ( - 8 - 20) = - 6 + 8 + 20 = 22

2) 4.1 - ( - 1.8 + 2.5) = 4.1 + 1.8 - 2.5 = 3.4

3) (14.5 - 85) + 55.8 = - 70.5 + 55.8 = - 14.7

4) (- 1 2/5 - 2 1/3) - 2/5 = ( - 7/5 - 7/3) - 2.5 = 
= (21 + 35 / 15) - 2.5 = 56/15 - 5/2 = 37/30

5) ( - 4 2/3 + 3 3/14) - 1 1/2 = ( - 14/3 + 45/14) - 3/2 = 
= ( - 196 + 135  /42) - 3/2 = - 61/42 - 3/2 = 
= 61 + 63 / 42 = 124/42 = 62/21