a) \(1\dfrac{5}{7} \times \dfrac{3}{4} = \dfrac{{12}}{7} \times \dfrac{3}{4} = \dfrac{{12 \times 3}}{{7 \times 4}}\) \( = \dfrac{{4 \times 3 \times 3}}{{7 \times 4}} = \dfrac{9}{7};\)
b) \(\dfrac{{10}}{{11}}:1\dfrac{1}{3} = \dfrac{{10}}{{11}}:\dfrac{4}{3} = \dfrac{{10}}{{11}} \times \dfrac{3}{4}\) \( = \dfrac{{10 \times 3}}{{11 \times 4}} = \dfrac{{5 \times 2 \times 3}}{{11 \times 2 \times 2}} = \dfrac{{15}}{{22}};\)
c) \(3,57 \times 4,1 + 2,43 \times 4,1\)
\(= (3,57 + 2,43) \times 4,1 \)
\(= 6 \times 4,1 \)
\(= 24,6 \)
d) \(3,42 : 0,57 \times 8,4 - 6,8\)
\(= 6 \times 8,4 - 6, 8\)
\(= 50,4 - 6,8\)
\(= \;43,6\)
