Question

Giúp mình với

Answer 1

a,

\(x=\dfrac{-3}{10}+\dfrac{2}{5}\)

\(x=\dfrac{1}{10}\)

b,

\(x-\dfrac{1}{2}=\dfrac{11}{4}\cdot\dfrac{5}{11}\)

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

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

\(x=\dfrac{7}{4}\)

c,

\(\dfrac{1}{2}.x^2-\dfrac{9}{2}=0\)

\(\dfrac{1}{2}.x^2=\dfrac{9}{2}\)

\(x^2=\dfrac{9}{2}:\dfrac{1}{2}\)

\(x^2=9\)

x = 3