Question

8 * 9/20 * 1 3/12 помогите​

Answer 1

Ответ:

8 * 9/20 * 1 3/12 =

$8*\frac{9}{20}*1\frac{3}{12}= 8*\frac{9}{20}*\frac{12*1+3}{12}= 8*\frac{9}{20}*\frac{15}{12}= 2*\frac{9}{5}*\frac{15}{12}= 2*\frac{9}{5}*\frac{5}{4}=2*9*\frac{1}{4}=9*\frac{1}{2}=$

$=4\frac{1}{2}$   или   4,5.