Question

Помогите пожалуйста .

Answer 1

Відповідь:

Покрокове пояснення:

Answer 2

Ответ:

Пошаговое объяснение:

$1) (5\frac{3}{5} -1\frac{1}{3}) :(7\frac{7}{12} -2\frac{1}{4} )*1,25=(5\frac{9}{15} -1\frac{5}{15}) :(7\frac{7}{12} -2\frac{3}{12} )*1\frac{1}{4} =4\frac{4}{15} :5\frac{1}{3} *1\frac{1}{4} =\frac{64}{15} *\frac{3}{16} *\frac{5}{4} =1$

$(3\frac{3}{4} *\frac{3}{5} -7\frac{1}{2} :27+1\frac{2}{9} ):(3\frac{1}{6} -1\frac{1}{4}) = (\frac{15}{4} *\frac{3}{5} -\frac{15}{2} *\frac{1}{27}+1\frac{2}{9}):(3\frac{2}{12} -1\frac{3}{12})=(\frac{9}{4} -\frac{15}{54} +1\frac{2}{9} ):1\frac{11}{12}=(\frac{9}{4} -\frac{5}{18} +\frac{11}{9} ) :\frac{23}{12}=(\frac{81}{36} -\frac{10}{36} +\frac{44}{36} )*\frac{12}{23} = \frac{115}{36} *\frac{12}{23}=\frac{5}{3} =1\frac{2}{3}$

$1)\frac{1}{4}x+ \frac{1}{6} x+\frac{1}{8} x=\frac{39}{56} \\ \\ \frac{6}{24}x+ \frac{4}{24} x+\frac{3}{24} x=\frac{39}{56}\\ \\ \frac{13}{24}x=\frac{39}{56} \\ \\ x=\frac{39}{56} *\frac{24}{13} \\ \\ x=\frac{9}{7} \\ \\ x=1\frac{2}{7}$

$2)2\frac{2}{3} x-1\frac{5}{7} =3\frac{1}{21} \\ \\ 2\frac{2}{3} x=3\frac{1}{21} +1\frac{5}{7}\\ \\ 2\frac{2}{3}x=3\frac{1}{21}+1\frac{15}{21} \\ \\ 2\frac{2}{3}x=4\frac{16}{21} \\ \\ x=4\frac{16}{21} :2\frac{2}{3} \\ \\ x=\frac{100}{21} *\frac{3}{8} \\ \\ x=\frac{25}{14} \\ \\ x=1\frac{11}{14}$

$3)3\frac{3}{14} -1\frac{7}{8}x=1\frac{2}{7} \\ \\ 1\frac{7}{8}x=3\frac{3}{14} -1\frac{2}{7} \\ \\ 1\frac{7}{8}x=3\frac{3}{14} -1\frac{4}{14} \\ \\ 1\frac{7}{8} x=1\frac{13}{14}\\ \\x=1\frac{13}{14} : 1\frac{7}{8}\\ \\ x=\frac{27}{14} *\frac{8}{15} \\ \\ x=\frac{36}{35} \\ \\ x=1\frac{1}{35}$

$4)\frac{4}{15} x+2\frac{1}{3}=7\frac{8}{15} \\ \\ \frac{4}{15} x=7\frac{8}{15}-2\frac{1}{3}\\ \\ \frac{4}{15}x=7\frac{8}{15} -2\frac{5}{15}\\ \\ \frac{4}{15}x=5\frac{3}{15} \\ \\ x=5\frac{1}{5}:\frac{4}{15}\\ \\ x=\frac{26}{5} *\frac{15}{4} \\ \\ x=\frac{39}{2} \\ \\ x=19\frac{1}{2}$