1. 3х^2 - 5x = 0.
2. x^2 - 2x - 2 = 0.
3. - 5x^2 + 7 = 0.
5x^2 = 7.
x1 = √(7/2) ; х2 = - √(7/2).
4. 3х^2 + 5х = 0.
х(3х + 5) = 0.
х1 = 0; 3х + 5 = 0.
х2 = - 5/3.
5. ((х - 2)²)/4 + ((х - 1)²)/2 - 2 = 0.
(х^2 - 4x + 4)/4 + (х^2 - 2x + 1)/2 - 2 = 0.
(3х^2 - 8x - 2)/4 = 0.
3х^2 - 8x - 2 = 0.
D = 64 - 24 = 40.
x1 = (8 + √40)/6 = (4 + √10)/3.
х2 = (8 - √40)/6 = (4 - √10)/3.