Question

помогите пж..........

Answer 1

№1) А: 4/7 : 5/9 = 4/7 * 9/5 = 1 1/35

Б: 7 11/12 : 3 1/6 = 95/12 : 19/6 = 95/12 * 6/19 = 2 1/2

В: 15/16 : 5 = 15/16 * 1/5 = 3/16

Г: 3/8 : 9/16 = 3/8 * 16/9 = 2/3

Д: 48 : 12/13 = 48/1 * 13/12 = 52

№2) (4 - 3/4 : 1 1/8) : 2/3 = 5

1) 3/4 : 1 1/8 = 3/4 * 8/9 = 2/3

2) 4 - 2/3 = 3 1/3

3) 3 1/3 : 2/3 = 10/3 * 3/2 = 5

№3) P = ( 15 * 2 ) + ( 3 1/2 * 2 ) = 30 + 7 = 37 (см)

Ответ: P = 37 см

№4) 48 * 5/7 = 34 2/7 (ф.)

Ответ: 34 2/7 фотографий чёрно-белые

№5) 1/3x + 5/9x = 7,2

8/9x = 7,2

x = 7,2 : 8/9

x = 8,1