Question

Tìm x:

1) \(\dfrac{1,2}{30}\)\(=\dfrac{3x+4}{50}\)

2) \(\dfrac{x-1}{x-5}\)\(=\dfrac{6}{7}\)

3) \(\dfrac{x-1}{3}\)\(=\dfrac{x+3}{5}\)

4) \(\dfrac{3}{7}\)\(=\dfrac{2x+1}{3x+5}\)

5) \(\dfrac{2x+3}{3x+1}\)\(=\dfrac{3}{4}\)

6) \(\dfrac{2x+3}{6}\)\(=\dfrac{7x-3}{15}\)

7) \(\dfrac{6x-5}{-7}\)\(=\dfrac{5x-3}{-5}\)

8) \(\dfrac{x+1}{x-2}\)\(=\dfrac{3}{4}\)

9) \(\dfrac{2x-3}{x+1}\)\(=\dfrac{4}{7}\)

10) \(\dfrac{2x+3}{7}\)\(=\dfrac{4x-1}{15}\)

11) \(\dfrac{2x+3}{24}\)\(=\dfrac{3x-1}{32}\)

12) \(\dfrac{2x+4}{7}\)\(=\dfrac{4x-2}{15}\)

13) \(\dfrac{11x-2}{7x+5}\)\(=\dfrac{11}{8}\)

14) \(\dfrac{12-7x}{-13}\)\(=\dfrac{4-3x}{-5}\)

15) \(\dfrac{52}{2x-1}\)\(=\dfrac{13}{30}\)

Answer 1

1) -2/3

Answer 2

1: \(\Leftrightarrow3x+4=2\)

=>3x=-2

=>x=-2/3

2: \(\Leftrightarrow7x-7=6x-30\)

=>x=-23

3: =>\(5x-5=3x+9\)

=>2x=14

=>x=7

4: =>9x+15=14x+7

=>-5x=-8

=>x=8/5