√(15 - √11)^2 + √(2 - √11)^2 = x;
15 - √11 + 2 - √11 = x;
17 - 2√11 = x;
(17 - 2√11)^2 = x^2;
289 - 2 * 11 = x^2;
267 = x^2;
x = √267;
x = ~16,34013463
1) 2х-у=3
3х-2у=5
-у=3-2х
у=2х-3
3х-2(2х-3)=5
3х-4х+6=5
-х=-1
х=1
у=2*1-3=-1
2) 2х+3у=12
х-у=1
х=1+у
2(1+у)+3у=12
2+2у+3у=12
5у=10
у=2
х=1+2=3
3) 3х+2у=12
2х-у=1
-у=1-2х
у=2х-1
3х+2(2х-1)=12
3х+4х-2=12
7х=14
х=2
у=2*2-1=3
1. =(-0,5)²*а²с⁴ 4³а⁶х³=1а⁸с⁴х³=а⁸с⁴х³
2. = 0,5*2³-3,9=0,5*8-3,9=4-3,9=0,1