6 Найдите значение выражения: (1/4 + 2/5)⋅10/13 + 1 7/8 ∶ 1/2 − 3.

(1/4 + 2/5) * 10/13 + 1 7/8 : 1/2 - 3 =

= (5/20 + 8/20) * 10/13 + 15/8 : 1/2 - 3 =

= (13/20) * (10/13) + 15/8 * 2/1 - 3 =

= (13*10)/(20*13) + (15*2)/(8*1) - 3 =

= 10/20 + 30/8 - 3 =

= 1/2 + 15/4 - 3 =

= 2/4 + 15/4 - 12/4 =

= (2 + 15 - 12) / 4 =

= 5/4 = 1 1/4

Ответ: 1 1/4