Question

помогите пожалуйста срочно надо ​

Answer 1

110

1. 5/7 = x/91

5 * 91 = 7 * x

7x = 455

x = 65

2. a / (2 3/23) = (3 2/7) / (1/4)

a / (29/23) = (23/7) / (1/4)

a/4 = 23/7 * 29/23

a/4 = 667/161

a/4 = 7

a = 28

123

25 * 1.2 = 30 (деталей)

124

5.6 / 1.4 = 4 (часа)

138

C = 2 * r * $\pi$ = 2 * 1.5 * 3.14 = 9.42 (см)

140

S = $\pi$ * $r^{2}$ = 3.14 * 4^2 = 3.14 * 16 = 50.24 ($cm^{2}$)