(7+3.5)(7-3.5)+(-3.5+3)=(10.5*3.5)-0.5=36.25
<span> 1+(tg(a))^2= 1/<span>(cos(a))^2</span></span>
P=(1-0,02)*(1-0,02)=0,98²=0,9604
p≈96%
17,5x=34,5+0,5
17,5x=35
x=35:17,5
x=2
( Х - 1 )( Х + 3 ) = х( Х - 2 )
Х^2 + 3х - Х - 3 = х^2 - 2х
Х^2 + 2х - 3 = х^2 - 2х
2х + 2х = 3
4х = 3
Х = 0,75