Помогите решить уравнения!!!!!Пожалуйста
1) x+2/x-4=5
2) x^2-4x+4=0
3)x^2-8x+15=0
4)x^2=-6x+16
5)-5x+x=0
6)4/5x^2-45=0

1) x + 2 / X - 4 = 5 ; X ≠ 4 x + 2 = 5 * ( x - 4 ) x + 2 = 5x - 20 4x = 22 x = 5,5 ---------------2) X² - 4x + 4 = 0 ( X - 2 )² = 0 x = 2 -------------------3) X² - 8x + 15 = 0 D = 64 - 60 = 4 ; √ D = 2 X1 = ( 8 + 2 ) : 2 = 5 X2 = ( 8 - 2 ) : 2 = 3 --------------------4) X² = - 6x + 16 X² + 6x - 16 = 0 D = 36 + 64 = 100 ; √ D = 10 X1 = ( - 6 + 10 ) : 2 = 2 X2 = ( - 6 - 10 ) : 2 = - 8----------------------5) - 5X + X = 0 - 4X = 0 X = 0 -----------------------6) 4/5X^2 - 45 = 0 0,8X^2 - 45 = 0 0,8 * ( X^2 - 56,25 ) = 0 X^2 = 56,25 X1 = 7,5 X2 = - 7,5 --------------------