giải các phương trình sau:a.2x + 3 = 7x - 7b. \(\dfrac{x}{x+2}+\dfrac{x-1}{x-2}=\dfrac{2x^2+x}{x^2-4}\)c.|x-1|=1d.6x - 2 = 2x + 10e. \(\dfrac{x}{2}+\dfrac{x+1}{3}=\dfrac{5}{2}\)f.|x-1|=x+2g.9x - 6 = 3x+12h.x(x-1)+3(x-1)=0i.\(\dfrac{7}{x}+\dfrac{2}{x+1}=\dfrac{x+23}{x\left(x+1\right)}\)j.8x - 3=6x +9k....
Đọc tiếp
giải các phương trình sau:
a.2x + 3 = 7x - 7
b. \(\dfrac{x}{x+2}+\dfrac{x-1}{x-2}=\dfrac{2x^2+x}{x^2-4}\)
c.|x-1|=1
d.6x - 2 = 2x + 10
e. \(\dfrac{x}{2}+\dfrac{x+1}{3}=\dfrac{5}{2}\)
f.|x-1|=x+2
g.9x - 6 = 3x+12
h.x(x-1)+3(x-1)=0
i.\(\dfrac{7}{x}+\dfrac{2}{x+1}=\dfrac{x+23}{x\left(x+1\right)}\)
j.8x - 3=6x +9
k. |x-1|-4=5
l.\(\dfrac{x-5}{x^2-16}+\dfrac{3}{x+4}=\dfrac{7}{x-4}\)
a)2x + 3 = 7x - 7
(=)2x-7x=-7-3
(=)-5x=-10
(=)x=-2
Vậy S={2}