$A=\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{9}{34}-\dfrac{32}{17}+\dfrac{2}{3}$
$A=(\dfrac{15}{34}+\dfrac{9}{34}-\dfrac{32}{17})+(\dfrac{7}{21}+\dfrac{2}{3}$
$A=(\dfrac{15}{34}+\dfrac{9}{34}-\dfrac{64}{34})+(\dfrac{7}{21}+\dfrac{14}{21}$
$A=\dfrac{-20}{17}+\dfrac{17}{17}=\dfrac{-3}{17}$
$B=\dfrac{114}{7}:\dfrac{-3}{5}-\dfrac{197}{7}:\dfrac{-3}{5}$
$B=\dfrac{114}{7}.\dfrac{-5}{3}-\dfrac{197}{7}.\dfrac{-5}{3}$
$B=\dfrac{-5}{3}.(\dfrac{114}{7}-\dfrac{197}{7})$
$B=\dfrac{-5}{3}.\dfrac{-83}{7}=\dfrac{415}{21}$
$C=25.(\dfrac{-1}{3})^3+\dfrac{1}{5}-2.(\dfrac{-1}{2})^2-\dfrac{1}{2}$
$C=25.\dfrac{-1}{27}+\dfrac{1}{5}-2.\dfrac{1}{4}-\dfrac{1}{2}$
$C=\dfrac{-25}{27}+\dfrac{1}{5}-\dfrac{1}{2}-\dfrac{1}{2}$
$C=\dfrac{-25}{27}+\dfrac{1}{5}-1$
$C=\dfrac{-125}{135}+\dfrac{27}{135}-\dfrac{135}{135}=\dfrac{-233}{135}$
$D=(-2)^3.(\dfrac{3}{4}-0,25):(\dfrac{9}{4}-\dfrac{7}{6})$
$D=-8.\dfrac{1}{2}:\dfrac{13}{12}$
$D=-4.\dfrac{12}{13}=\dfrac{-48}{13}$
$E=5\sqrt{16}-4\sqrt{9}+\sqrt{25}-0,3\sqrt{400}$
$E=5.4-4.3+5-0,3.20=20-12+5-6=7$
$F=(\dfrac{-3}{2})^2+|\dfrac{-5}{6}|-\dfrac{3}{2}:6$
$F=\dfrac{9}{4}+\dfrac{5}{6}-\dfrac{1}{4}$
$F=\dfrac{9}{4}-\dfrac{1}{4}+\dfrac{5}{6}$
$F=2+\dfrac{5}{6}=\dfrac{17}{6}$
