Question

Answer 1

Bài 3: 

a: x/5=2/3

nên x=15/2

b: \(\dfrac{x}{3}-\dfrac{1}{2}=\dfrac{1}{5}\)

\(\Leftrightarrow x\cdot\dfrac{1}{3}=\dfrac{7}{10}\)

hay x=21/10

c: \(\dfrac{x+3}{15}=\dfrac{1}{3}\)

nên x+3=5

hay x=2

d: \(\dfrac{x-12}{4}=\dfrac{1}{2}\)

nên x-12=2

hay x=14

Answer 2

Bài 3 : 

a, \(\Rightarrow x=\dfrac{5.2}{3}=\dfrac{10}{3}\)

c, \(\Rightarrow x+3=\dfrac{15}{3}=5\Leftrightarrow x=2\)

b, \(\Leftrightarrow\dfrac{x}{3}=\dfrac{1}{5}+\dfrac{1}{2}=\dfrac{7}{10}\Leftrightarrow x=\dfrac{21}{10}\)

d, \(\Rightarrow x-12=2\Leftrightarrow x=14\)