1. Вычислите: а) 6/11 · 5/9; б) (2/5)²; в) (1 1/3)³; г) 3 · 7/13; д) 4/9 · 2.
- \(\frac{6}{11}\cdot\frac{5}{9}=\frac{6\cdot5}{11\cdot9}=\frac{30}{99}=\frac{10}{33}\).
- \(\left(\frac25\right)^2=\frac25\cdot\frac25=\frac{2\cdot2}{5\cdot5}=\frac4{25}\).
- \(\left(1\frac13\right)^3=\left(\frac43\right)^3=\frac43\cdot\frac43\cdot\frac43=\frac{4\cdot4\cdot4}{3\cdot3\cdot3}=\frac{64}{27}=2\frac{10}{27}\).
- \(3\cdot\frac7{13}=\frac31\cdot\frac7{13}=\frac{3\cdot7}{1\cdot13}=\frac{21}{13}=1\frac8{13}\).
- \(\frac49\cdot2=\frac49\cdot\frac21=\frac{4\cdot2}{9\cdot1}=\frac89\).