(1 3\4+2 4\5)*30 помогите

Question

(1 3\4+2 4\5)*30 помогите

Answer 1

(1 3/4+2 4/5)*30=(1 15/20+2 16/20)*30=3 31/20*30=4 11/20*30=
=91/20*30=91/2*3=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 = ( 91•3 )/2 = 273/2 = 136 1/2
Ответ 136 1/2