Question

Tìm x biết 

a, x/5 = -12/20

b, 3x - 35 = -45 -2x

c, -1/6 - x = 5/12 + -2/3

Answer 1

a, ta có : X*20=5*(-12)

             20X=-60

             X=-60/20

             X=-3

Answer 2

a, \(\frac{x}{5}=\frac{-12}{20}\)

\(x=\frac{5.\left(-20\right)}{20}\)

\(x=-5\)

b, 3x - 35 = -45 - 2x

3x + 2x = -45 + 35

5x = -10

x = (-10) : 5

x = -2

c, \(\frac{-1}{6}-x=\frac{5}{12}+\frac{-2}{3}\)

\(\frac{-1}{6}-x=\frac{-1}{4}\)

\(-x=\frac{-1}{6}-\frac{-1}{4}\)

\(-x=\frac{1}{12}\)

\(x=\frac{-1}{12}\)