2^(2-log2 5) = 2^2 / 2^log2 5 = 4 / 5 = 0.8
После 2 скобки точно делить надо?
3y-2x=69=> 1.5y-x=34.5
4.5x+2y=536=> x+(2/4.5)y=536/4.5
1.5y-x+x+(2/4.5)y=34.5+536/4.5
(27/18)y + (8/18)y = (621+2144)/18
(35/18)y=2765/18
y= 2765/35
y=79
3*79-2x=69
x=(237-69)/2
x=84