Ответ на 270 . пожалуйста

$1) \frac{25}{80} + \frac{45}{60} = \frac{5*5}{5*16}+ \frac{3*15}{4*15}= \frac{5}{4*4} + \frac{3}{4} = \frac{5+3*4}{4*4} = \frac{17}{16} =1 \frac{1}{16}$

2)
$\frac{20}{45}+ \frac{25}{54} = \frac{5*4}{5*9}+ \frac{25}{6*9}=\frac{4}{9}+ \frac{25}{6*9}= \frac{4*6+25}{6*9} = \frac{49}{54}$

3) $\frac{36}{300}+ \frac{12}{40} - \frac{350}{1000} = \frac{3*12}{25*12} + \frac{3*4}{10*4} - \frac{7*50}{20*50} = \frac{3}{25} + \frac{3}{10} - \frac{7}{20} =$ $\frac{3*4+3*10-7*5}{100} = \frac{12+30-35}{100} = \frac{7}{100} =0,07$

4) $\frac{14}{24} - \frac{39}{90} + \frac{15}{100} = \frac{2*7}{2*12}- \frac{3*13}{3*30}+ \frac{3*5}{20*5}= \frac{7}{12} - \frac{13}{30} + \frac{3}{20} = [tex] \frac{7*5}{12*5} - \frac{13*2}{30*2} + \frac{3*3}{20*3} = \frac{35-26+9}{60}= \frac{18}{60} = \frac{3*6}{10*6} \frac{3}{10} =0,3$

5)
$\frac{42}{120}+ \frac{20}{32}-\frac{28}{160}=\frac{6*7}{6*20} + \frac{5*4}{8*4}- \frac{7*4}{4*40}= \frac{7}{20}+ \frac{5}{8}- \frac{7}{40}= \frac{7*2}{20*2} + \frac{5*5}{8*8} - \frac{7}{40}=$ $\frac{14+25-7}{40} = \frac{32}{40}= \frac{8*4}{8*5}= \frac{4}{5} =0,8$

6) $\frac{45}{72}- \frac{33}{144}- \frac{20}{64}= \frac{5*9}{8*9}- \frac{3*11}{3*48}- \frac{5*4}{16*4}= \frac{5*6}{8*6}- \frac{11}{48}- \frac{3*5}{3*16}= \frac{30-11-15}{48}= \frac{4}{4*12}$ $= \frac{1}{12}$

Ответ ** 270 . пожалуйста