Question

a.x/60=-3/4

b.  2/5=12/x

c.  x-5/7 =6/21

dx+7/8 =63/24 

e x/6=24/x

f .x+5= 4/x+5

g.  x+12/x+8=4/3 

h. x+9/x+7=9/8

Answer 1

a)\(\dfrac{x}{60}=-\dfrac{3}{4}\)

\(\Rightarrow x\cdot4=60\cdot\left(-3\right)\)

   \(x\cdot4=-180\)

  x=45

b)\(\dfrac{2}{5}=\dfrac{12}{x}\)

   \(\Rightarrow2x=5\cdot12\)

      \(2x=60\)

       x=30

c)\(x-\dfrac{5}{7}=\dfrac{6}{21}\)

      \(x=\dfrac{2}{7}+\dfrac{5}{7}\)

      x=1

d)\(x+\dfrac{7}{8}=\dfrac{63}{24}\)

     \(x=\dfrac{21}{8}-\dfrac{7}{8}\)

     \(\dfrac{14}{8}\)

Answer 2

a)\(\dfrac{x}{60}=\dfrac{-3}{4}\Rightarrow x=\dfrac{-3.60}{4}=-45\)

Answer 3

b)\(\dfrac{2}{5}=\dfrac{12}{x}\Rightarrow x=\dfrac{5.12}{2}=30\)

Answer 4

c)\(\dfrac{x-5}{7}=\dfrac{6}{21}\Rightarrow x-5=\dfrac{6.7}{21}=2\Rightarrow x=2+5=7\)

Answer 5

d)\(\dfrac{x+7}{8}=\dfrac{63}{24}\Rightarrow x+7=\dfrac{8.63}{24}=21\\ \Rightarrow x=21-7=14\)

Answer 6

a: \(\dfrac{x}{60}=-\dfrac{3}{4}\)

nên x=-45

b: \(\dfrac{2}{5}=\dfrac{12}{x}\)

nên x=30

c: \(x-\dfrac{5}{7}=\dfrac{6}{21}\)

nên x=1

d: Ta có: \(x+\dfrac{7}{8}=\dfrac{63}{24}\)

nên x=2