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\(7{,}7\cdot5{,}3=40{,}81\)

\(\frac78:\frac56=\frac78\cdot\frac65=\frac{21}{20}=1\frac1{20}\)

\(\frac1{25}-\frac7{50}=\frac2{50}-\frac7{50}=-\frac1{10}\)

\(4{,}7-8{,}2=-3{,}5\)

\(12\frac25\cdot5=62\)

\(\frac15-\frac{41}{50}=\frac{10}{50}-\frac{41}{50}=-\frac{31}{50}\)

\(6{,}9+7{,}4=14{,}3\)

\(9{,}6:1{,}6=6\)

\(3{,}9-7{,}3=-3{,}4\)

\(\frac{21}{5}\cdot\frac37=\frac95=1\frac45\)