Question

8/15•х-9/20•х якщо х=1,2
9/14•х+4/21•х якщо х=0,6​

Answer 1

Ответ:

Пошаговое объяснение:

$\frac{8}{15} x-\frac{9}{20}x=x(\frac{8}{15}-\frac{9}{20})=x(\frac{32}{60}-\frac{27}{60})=\frac{5}{60} x=\frac{1}{12}x\\ \\ esli\ x= 1,2\\ \\ \frac{1}{12} x=\frac{1}{12}*1,2=\frac{1}{12} *\frac{12}{10} =\frac{1}{10} \\ \\ Otvet:\frac{1}{10}$

$\frac{9}{14} x+\frac{4}{21} x=x(\frac{9}{14} +\frac{4}{21})=x(\frac{27}{42}+\frac{8}{42})=\frac{35}{42} x=\frac{5}{6}x\\ \\ esli\ x = 0,6\\ \\ \frac{5}{6}x=\frac{5}{6}*0,6=\frac{5}{6} *\frac{6}{10} =\frac{1}{2} \\ \\ Otvet:\frac{1}{2}$