<span>а) ах=а + 6
x = (a+6)/a = 1 + 6/a
б) с(с-2)х=c^2 -4</span>
x = (c^2-4)/c(c-2)
x = (c+2)/c
При с не равном 2
(2x -3)/(5x -20) -(x-2)/(2x-8) =(2x -3)/5(x -4) -(x-2)/2(x-4) = (2(2x-3) -5(x-2) )/10(x-4) =
(4x-6 -5x+10)/10(x-4) = (-x +4)/10(x-4) = -(x-4)/10(x-4) = -1/10 = -0,1.
ОДЗ
x ≥ 0
( - 2x + 3)^2 = x^2
(-2x)^2 - 12x + 9 - x^2 = 0
4x^2 - 12x + 9 - x^2 = 0
3x^2 - 12x + 9 = 0 /:3
x^2 - 3x + 2 = 0
D = 9 - 8 = 1
x1 = ( 3 + 1)/2 = 4/2 = 2
x2 = (3 - 1)/2 = 2/2 = 1
Ответ
1; 2
1)x(5x-2)=0
x=0 или 5x-2=0
x=0.4
ответ:0;0.4
2)x(3x+5)=0
x=0 или 3x+5=0
x=-5/3
ответ:0;-5/3