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1.4E: Вправи
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11. $\left(−\dfrac{14}{15}\right)\left(\dfrac{9}{20}\right)$ 61. $\dfrac{\left(\dfrac{3}{5}\right)^2}{\left(\dfrac{3}{7}\right)^2}$ 62. \(\dfrac{\left(\dfrac{3}{4}\right)^2}{\left(\dfrac{5}{8}\rig...11. $\left(−\dfrac{14}{15}\right)\left(\dfrac{9}{20}\right)$ 61. $\dfrac{\left(\dfrac{3}{5}\right)^2}{\left(\dfrac{3}{7}\right)^2}$ 62. $\dfrac{\left(\dfrac{3}{4}\right)^2}{\left(\dfrac{5}{8}\right)^2}$ 66. $\dfrac{\dfrac{3}{4}−\dfrac{3}{5}}{\dfrac{1}{4}+\dfrac{2}{5}}$ 85. $\left(\dfrac{5}{9}+\dfrac{1}{6}\right)÷\left(\dfrac{2}{3}−\dfrac{1}{2}\right)$ 86. $\left(\dfrac{3}{4}+\dfrac{1}{6}\right)÷\left(\dfrac{5}{8}−\dfrac{1}{3}\right)$