(х-216)-408=159
(х-216)=408+159
(х-216)=567
х=567+216
х=783
Проверка
(783-216)-408=159
159=159
√5-x=2
-x=2-√5
x=√5-2
x=2.24-2
x=0.24
(2х-1)/(2х+1)=2
х≠-1/2
2х-1=4х+2
4х-2х=-1-2
2х=-3
х=-1,5
(0.005-0.205)*1.25+1/3
(-0.2)*1.25+1/3
-0.25+1/3
-0.25/100+1/3
-1/4+1/3
-3+4/12
1/12