tìm x,y,z
a, \(\dfrac{\left(x-2\right)^2}{-1}\) = \(\dfrac{1}{2-x}\) (x ≠ 2)
b, \(\dfrac{x-2}{3.2-x}\) = \(\dfrac{1}{2}\) (x ≠ 3.2)
c, \(\dfrac{x-1}{3}\) = \(\dfrac{x+3}{5}\)
d, 4x(x-5)-(x-1)(4x-3)=5
e, (x-5)(-x+4)-(x-1)(x+3)=\(-2x^2\)
f, (x-3)(\(x^2\)+3x+9)+x(5-\(x^2\))=6x
h, (x-5)(x-4)-(x+1)(x-2)=7
l, \(\dfrac{x}{2}\)=\(\dfrac{y}{3}\);\(\dfrac{y}{4}\)=\(\dfrac{z}{5}\) và x+y+z=5
m, \(\dfrac{y}{3}\)=\(\dfrac{z}{5}\); 4x=3y và 3x - z = 21