Question

помогите пожалуйста.

Answer 1

1)
$frac{1}{5} +0,2* frac{5}{7} = frac{1}{5} + frac{1}{5} * frac{5}{7} = frac{1}{5} + frac{1}{7} = frac{7+5}{35}= frac{12}{35}$
======
2)
$1,4* frac{3}{4} - frac{1}{9}=1 frac{2}{5} * frac{3}{4} - frac{1}{9} = frac{7}{5} * frac{3}{4} - frac{1}{9} = frac{21}{20} - frac{1}{9} = frac{189-20}{180} = frac{169}{180}$
======
3)
$frac{2}{9} *1 frac{1}{2} +0,1= frac{2}{9} * frac{3}{2} + frac{1}{10} = frac{1}{3} + frac{1}{10} = frac{10+3}{30} = frac{13}{30}$
==========

$(1 frac{2}{5} - frac{1}{3} )* frac{5}{8} =( frac{7}{5} - frac{1}{3} )* frac{5}{8} = frac{7}{8} - frac{5}{24} = frac{21-5}{24} = frac{16}{24} = frac{2}{3}$
==========
$( frac{1}{4} +0,2)* frac{5}{8} =( frac{1}{4} + frac{1}{5} )* frac{5}{8} =( frac{5+4}{20} )* frac{5}{8} = frac{9}{20} * frac{5}{8} = frac{9}{32}$
==============
$frac{3}{4} *(2,7+ frac{11}{25} )= frac{3}{4} *( frac{27}{10} + frac{11}{25} )= frac{3}{4} *( frac{135+22}{50} )= frac{3}{4} * frac{157}{50} = frac{471}{200} =2 frac{71}{200}$
==========
4)
$5,2* frac{1}{13} = frac{52}{10} * frac{1}{13} = frac{52}{130} = frac{26}{65}$кг
===========
5)
$10 frac{1}{5} * frac{10}{17} = frac{51}{5} * frac{10}{17} = 6$га
===========
6)
$4,25*1 frac{1}{7} = frac{425}{100} * frac{8}{7} = frac{850}{175} =4 frac{150}{175} =4 frac{6}{7}$$M^{2}$
==========