Question

Решить уровнения
...........

Answer 1

№1.

$8,4*(y-17,9)=4,2\\y-17,9=0,5\\y=0,5+17,9\\y=18,4$

№2.

$20:(6\frac{3}{11}+1\frac{8}{11})+(7\frac{2}{5}-5,8):5=20:((6+1)+(\frac{3}{11}+\frac{8}{11}))+(\frac{37}{5}-\frac{29}{5})*\frac{1}{5}=20:(7+1)+\frac{8}{5}*\frac{1}{5}=20:8+\frac{8}{25}=2,5+\frac{8}{25}=\frac{5}{2}+\frac{8}{25}=\frac{141}{50}$