Вычислите: А)4*1/5+4*3/7-4*1/36 Б)3/8*5+5/56-1/7:1/5 В)3/2*5/6+3/2:9/10-3/2*13/18...

А) $4* \frac{1}{5}+4* \frac{3}{7}-4* \frac{1}{36}=4( \frac{1}{5} + \frac{3}{7} - \frac{1}{36} ) =4( \frac{7}{35}+ \frac{15}{35}- \frac{1}{36})=4( \frac{22}{35}- \frac{1}{36})$ $=4( \frac{792}{1260}- \frac{35}{1260})=4* \frac{757}{1260}= \frac{4*757}{1260}=\frac{757}{315}=2 \frac{127}{315}$
б) $\frac{3}{8}*5+ \frac{5}{56}- \frac{1}{7}: \frac{1}{5}= \frac{15}{8}+ \frac{5}{56}- \frac{1}{7}* \frac{5}{1}= \frac{105}{56}+ \frac{5}{56}- \frac{40}{56}= \frac{70}{56}= \frac{35}{28}= \frac{5}{4}=$ $1 \frac{1}{4}$
в) $\frac{3}{2} * \frac{5}{6} + \frac{3}{2} : \frac{9}{10} - \frac{3}{2} * \frac{13}{18}= \frac{3}{2} * \frac{5}{6} + \frac{3}{2} * \frac{10}{9} - \frac{3}{2} * \frac{13}{18}= \frac{3}{2}( \frac{5}{6}+ \frac{10}{9}- \frac{13}{18})=$ $\frac{3}{2}( \frac{15}{18}+ \frac{20}{18}- \frac{13}{18})= \frac{3}{2}* \frac{22}{18}= \frac{3*22}{2*18}= \frac{11}{6}=1 \frac{5}{6}$
г) $\frac{4}{5}: \frac{5}{8}- \frac{4}{5}* \frac{24}{25}+ \frac{1}{25}: \frac{5}{4}= \frac{4}{5}* \frac{8}{5}- \frac{4}{5}* \frac{24}{25}+ \frac{1}{25}* \frac{4}{5}= \frac{4}{5}(\frac{8}{5}- \frac{24}{25}+ \frac{1}{25})=$ $\frac{4}{5}( \frac{40}{25}- \frac{24}{25}+ \frac{1}{25})= \frac{4}{5}* \frac{17}{25}= \frac{4*17}{5*25}= \frac{68}{125}$