Question

Вычислите
1)5 5/7*9/20
2)2 1/4:1 1/8
3)-5 1/2*(-8 1/11)
4)-3 5/9*4 7/8
5)1,2+3/7
6)-0,4+5/6

Answer 1

1.$5 frac{5}{7}* frac{9}{20} = frac{40}{7} * frac{9}{20} = frac{2*9}{7} = frac{18}{7} = 2frac{4}{7}$
2.$2 frac{1}{4} :1 frac{1}{8} = frac{9}{4} : frac{9}{8} = frac{9}{4} * frac{8}{9}= 2$
3.$-5frac{1}{2} *( -8frac{1}{11} )= frac{11}{2} * frac{89}{11} = frac{89}{2} = 44frac{1}{2}$
4.$-3 frac{5}{9} *4 frac{7}{8} =- frac{32}{9} * frac{39}{8} =- frac{4*39}{9}= -frac{156}{9}=-17 frac{3}{9}=-17 frac{1}{3}$
5.$1,2+ frac{3}{7} =1 frac{2}{10}+ frac{3}{7}= frac{12}{10} + frac{3}{7} = frac{84}{70} + frac{30}{70}= frac{114}{70}= 1 frac{44}{70}= frac{22}{35}$
6.$-0,4+ frac{5}{6} =- frac{4}{10} + frac{5}{6} =- frac{24}{60} + frac{50}{60}= frac{26}{60}= frac{13}{35}$

Answer 2

Спасибо большое