Question

Решите.Срочно.даю 40
балов.все уравнения

Answer 1

Вариант Б2 

а) $(3 frac{2}{3} - 1,8) : 2 frac{4}{5} = (frac{11}{3} - frac{9}{5} ) : frac{14}{5} = frac{55-27}{15} : frac{14}{5} = frac{28}{15} : frac{14}{5} = frac{28*5}{15*14} = frac{2}{3}$

б) $( frac{3}{4} + 4 frac{2}{3}* frac{9}{56})*1 frac{2}{3} = (frac{3}{4} + frac{14}{3}* frac{9}{56})* frac{5}{3} = ( frac{3}{4} + frac{14*9}{3*56})* frac{5}{3} = ( frac{3}{4} + frac{3}{4}) * frac{5}{3}$$= frac{6}{4} * frac{5}{3} = frac{6*5}{4*3} = frac{5}{2} = 2 frac{1}{2}$

Вариант В2

а) $(5 - 1 frac{1}{3}*1 frac{1}{6})* frac{27}{31} = (5 - frac{4}{3} * frac{7}{6}) * frac{27}{31} = (5 - frac{4*7}{3*6}) * frac{27}{31} = (5 - frac{14}{9})* frac{27}{31}$$= ( frac{45-14}{9})* frac{27}{31} = frac{31}{9}* frac{27}{31} = frac{31*27}{9*31} = frac{27}{9} = 3$

б) $(4,1 - 2 frac{3}{4} ):(1 frac{16}{21} + 4 frac{2}{3}) = ( frac{41}{10} - frac{11}{4}) : ( frac{37}{21} + frac{14}{3}) = (frac{82-55}{20}) : ( frac{37+98}{21})$$= frac{27}{20} : frac{135}{21} = frac{27*21}{20*135} = frac{21}{20*5} = frac{21}{100}$

Удачи!