873. 1) (6,72 : 3/5 + 1 1/8 · 0,8) : 1,21 − 6 3/8; 2) 3,075 : 1,5 − 1/4 · (1/25 + 3,26)

1)

\(6{,}72 : \frac{3}{5}=6{,}72\cdot\frac{5}{3}=11{,}2\).

\(1\frac{1}{8}\cdot0{,}8=\frac{9}{8}\cdot\frac{4}{5}=0{,}9\).

\((11{,}2+0{,}9):1{,}21-6\frac{3}{8}=12{,}1:1{,}21-6\frac{3}{8}=10-6\frac{3}{8}=3\frac{5}{8}\).

2)

\(3{,}075:1{,}5=2{,}05\).

\(\frac{1}{25}+3{,}26=0{,}04+3{,}26=3{,}3\).

\(\frac{1}{4}\cdot3{,}3=0{,}825\).

\(2{,}05-0{,}825=1{,}225\).

Ответ: 1) \(3\frac{5}{8}\); 2) \(1{,}225\).