Question

СОР ТОМУ И ПОДПИСКУ НА НИХ ​

Answer 1

$0,5:100=\frac{1}{2}:100=\frac{1}{2}\cdot \frac{1}{100}=\frac{1}{200}=\frac{1\cdot 5}{200\cdot 5}=\frac{5}{1000}=0,005 \\ \\ 0,63:17,5=\frac{63}{100}:\frac{175}{10}=\frac{63}{100}\cdot \frac{10}{175}=\frac{63}{10\cdot 175}=\frac{9}{10\cdot25}=\frac{9}{250}=\frac{9\cdot 4}{250\cdot 4}=\frac{36}{1000}=\\ \\ =0,036$

$3\frac{3}{4}\cdot1\frac{1}{5}+(2,55+2,7):(0,1-\frac{1}{80})=\frac{15}{4}\cdot\frac{6}{5}+(\frac{255}{100}+\frac{270}{100}):(\frac{1}{10}-\frac{1}{80})=\\ \\ =\frac{3\cdot3}{2}+(\frac{255+270}{100}):(\frac{8-1}{80})=\frac{9}{2}+\frac{525}{100}:\frac{7}{80}=\frac{9}{2}+\frac{525}{100}\cdot \frac{80}{7}=\frac{9}{2}+\frac{525}{5}\cdot \frac{4}{7}= \\ \\ =\frac{9}{2}+105\cdot \frac{4}{7}=\frac{9}{2}+15\cdot 4=\frac{9}{2}+60=\frac{9+120}{2}=\frac{129}{2}$