Question

Выполните умножение смешанных чисел:
1)2 1/3 × 1 1/5
3) 2 1/2 × 1 3/5
5) 7 1/2 × 2 4/15

Answer 1

Ответ: 2 4/5; 4; 17.

Пошаговое объяснение:

1)     2 1/3 * 1 1/5 = (2*3+1)/3 * (1*5+1)/5 = 7/3 * 6/5 = 7*6/5*3 = 7*2*3/5*3=

= 7*2/5 = 14/5 = (10+4)/5 = 10/5 + 4/5 = 2 + 4/5 = 2 4/5

2)     2 1/2 * 1 3/5 = (2*2+1)/2 * (1*5+3)/5 = 5/2 * 8/5 = 5*8/2*5 = 8/2 = 4

5)     7 1/2 * 2 4/15 = (7*2+1)/2 * (2*15+4)/15 = 15/2 * 34/15 = 15*34/2*15 =

= 34/2 = 17