Question

Найдите значение выражения:
Номер 120, а) и б)

Answer 1

И что тут сложного?
$\frac{70,2*0,5}{9*1 \frac{1}{2} }- \frac{2,4*10,8}{4*1 \frac{4}{5} }- \frac{1,4*16,2}{3*1 \frac{1}{5} } =$
$= \frac{7,8*9*0,5}{9*3/2} - \frac{4*0,6*10,8}{4*9/5}- \frac{1,4*3*5,4}{3*6/5}=\frac{7,8*0,5}{3/2} - \frac{0,6*10,8}{9/5}- \frac{1,4*5,4}{6/5}=$
$= \frac{7,8/2}{3/2}- \frac{10,8*3/5}{9/5}- \frac{1,4*27/5}{6/5}= \frac{7,8}{3}- \frac{10,8}{3}-0,7*9=$
$=2,6-3,6-6,3=-7,3$

$\frac{ \frac{8}{15}*1 \frac{9}{16}}{1,5} + \frac{1 \frac{1}{9}* \frac{3}{5}}{1,6} + \frac{2 \frac{2}{3}* \frac{3}{16}}{1,8} = \frac{8/15*25/16}{3/2}+ \frac{10/9*3/5}{8/5}+ \frac{8/3*3/16}{9/5}=$
$= \frac{5/6}{3/2}+ \frac{2/3}{8/5}+ \frac{1/2}{9/5}= \frac{10}{18}+ \frac{10}{24}+ \frac{5}{18}= \frac{15}{18}+ \frac{5}{12}= \frac{5}{6}+ \frac{5}{12}= \frac{15}{12}= \frac{5}{4}$