1) tg x = √3
x = arc tg √3 + πn, n∈Z
x =
+ πn, n∈Z
2) tg x = -1
x = arc tg (-1) + πn, n∈Z
x = -
+ πn, n∈Z
3) tg x = -5
x = arc tg (-5) + πn, n∈Z
1кг=100г
500+200=700
1700-700=1000
100*4=4000 )
<span>-(a-b)-(b-c)=</span>-a+b-b+c=c-a
320 : ( 38 + х ) = 4
38 + х = 320 : 4
38 + х = 80
x = 80 - 38
x = 42