Question

Найдите значение выражения: (1 3/4 + 2 4/5) * 30

Answer 1

1 3/4 = 7/4

2 4/5 = 14/5

7/4 + 14/5 = 35/20 + 56/20 = 91/20

91/20 * 30/1 =(91*3)/2 =273/2 = 136 1/2

Answer 2

1)1 3/4+2 4/5= 1 15/20+2 16/20=3 31/20= 4 11/20

2)4 11/20*30=91/20*30/1=91/2*3=273/2= 136 1/2(= 136,5)