X -1 = 5x + 2
x-5x = 2+1
-4x= 3
x= -3/4
x= -0,75
(3+2√2)*(1-√2)^2 =
(3+2√2)(1-2
√2+2)=
(3+2√2)(3-2√2)=
3^2- (2√2)^2=9-8-1
У(5у-2)=0
у1=0
5у-2=0
5у=2
у2=2/5
у2=0.4
...............................................
1)(6а-13б)*(6а+13б)
2)(5x+8y)(5x-8y)-80xy (неуверена)
3)(5x+3b)(25x^2-15xb+9b^2)