\(7,3\times8,9+7,3\times1,1\times7,3\\ =7,3\times\left(8,9+1,1\right)\times7,3\\ =7,3\times10\times7,3\\ =73\times7,3\\ =532,9\)

\(-\dfrac{5}{7}\times\dfrac{2}{11}+-\dfrac{5}{7}\times\dfrac{9}{11}+\dfrac{5}{7}\\ =-\dfrac{5}{7}\times\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{5}{7}\\ =-\dfrac{5}{7}\times1+\dfrac{5}{7}\\ =-\dfrac{5}{7}+\dfrac{5}{7}\\ =0\)

\(A=\dfrac{2}{13}\times\dfrac{5}{9}+\dfrac{2}{13}\times\dfrac{4}{9}+\dfrac{11}{13}\\ A=\dfrac{2}{13}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\dfrac{11}{13}\\ A=\dfrac{2}{13}\times1+\dfrac{11}{13}\\ A=\dfrac{2}{13}+\dfrac{11}{13}\\ A=1\)

\(B=\dfrac{1}{10}\times\dfrac{4}{11}+\dfrac{1}{10}\times\dfrac{8}{11}-\dfrac{1}{10}\times\dfrac{1}{11}\\ B=\dfrac{1}{10}\times\left(\dfrac{4}{11}+\dfrac{8}{11}-\dfrac{1}{11}\right)\\ B=\dfrac{1}{10}\times1\\ B=\dfrac{1}{10}\)

\(1,2\times\dfrac{17}{23}+1\dfrac{1}{5}\times\dfrac{6}{23}\\ =1,2\times\dfrac{17}{23}+1,2\times\dfrac{6}{23}\\ =1,2\times\left(\dfrac{17}{23}+\dfrac{6}{23}\right)\\ =1,2\times1\\ =1,2\)

\(-\dfrac{5}{9}\times-\dfrac{12}{25}=\dfrac{-5\times\left(-12\right)}{9\times25}=\dfrac{60}{225}=\dfrac{4}{45}\)

\(\dfrac{3}{7}\times\dfrac{4}{11}+\dfrac{3}{7}\times\dfrac{7}{11}-2\\ =\dfrac{3}{7}\times\left(\dfrac{4}{11}+\dfrac{7}{11}-2\right)\\ =\dfrac{3}{7}\times1-2\\ =\dfrac{3}{7}-2\\ =\dfrac{3}{7}-\dfrac{14}{7}\\ =-\dfrac{11}{7}\)

\(\left(\dfrac{617}{191}+\dfrac{29}{33}-\dfrac{115}{117}\right)\times\left(\dfrac{1}{4}-\dfrac{1}{5}-\dfrac{1}{20}\right)\\ =\left(\dfrac{617}{191}+\dfrac{29}{33}-\dfrac{115}{117}\right)\times0\\ =0\)

\(x:0,25-x:2=35\\ \Rightarrow x\times4-x\times\dfrac{1}{2}=35\\ \Rightarrow x\times\left(4-\dfrac{1}{2}\right)=35\\ \Rightarrow x\times\left(\dfrac{8}{2}-\dfrac{1}{2}\right)=35\\ \Rightarrow x\times\dfrac{7}{2}=35\\ \Rightarrow x=35:\dfrac{7}{2}\\ \Rightarrow x=10\)

\(1,2:x+0,05:x=5\\ \Rightarrow\left(1,2+0,05\right):x=5\\ \Rightarrow1,25:x=5\\ \Rightarrow x=1,25:5\\ \Rightarrow x=0,25\)