Решите плиз!!!!очень надо

1.
а) $\frac{4}{7}: \frac{5}{9}= \frac{4}{7}* \frac{9}{5}= \frac{36}{35}=1 \frac{1}{35}$
б) $\frac{3}{8}: \frac{9}{16}= \frac{3}{8}* \frac{16}{9}= \frac{1}{1}* \frac{2}{3}=1* \frac{2}{3}= \frac{2}{3}$
в) $7 \frac{11}{12}:3 \frac{1}{6}= \frac{95}{12}: \frac{19}{6}= \frac{95}{12}* \frac{6}{19}= \frac{5}{2}* \frac{1}{1}=2 \frac{1}{2}* 1=2 \frac{1}{2}= 2.5$
г) $48: \frac{12}{13}= \frac{48}{1}: \frac{12}{13}= \frac{48}{1}* \frac{13}{12}= \frac{4}{1}* \frac{13}{1}=4*13=52$
д) $\frac{15}{16}:5= \frac{15}{16}: \frac{5}{1}= \frac{15}{16}* \frac{1}{5}= \frac{3}{16}* \frac{1}{1}= \frac{3}{16}*1= \frac{3}{16}$

2.
1) $2: \frac{2}{5}= \frac{2}{1}* \frac{5}{2}= \frac{1}{1}* \frac{5}{1}=1*5=5$
2) $6*5=30$
Ответ: $30$ руб.

3.
$x- \frac{8}{15}x=4 \frac{1}{5}$
$\frac{15}{15}x- \frac{8}{15}x=4 \frac{1}{5}$
$\frac{7}{15}x= \frac{21}{5}$
$x= \frac{21}{5}: \frac{7}{15}$
$x= \frac{21}{5}* \frac{15}{7}$
$x= \frac{3}{1}* \frac{3}{1}=3*3$
$x=9$

4.
1-ый вагон $=91$ т.
2-ой вагон $= \frac{91}{1}* \frac{7}{6}=106 \frac{1}{6}$ т.

5.
$\frac{5}{6}- \frac{x}{y}= \frac{5-x}{6-x}$