Question

giải các phương trình
a) x-1/3 + 2 = 5
3(2x + 1)/4 - 5x +3/6 + x+1/3 = x + 7/2

Answer 1

a.

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

\(\Leftrightarrow\dfrac{x-1}{3}+\dfrac{6}{3}=\dfrac{15}{3}\)

\(\Leftrightarrow x-1+6=15\)

\(\Leftrightarrow x-1+6-15=0\)

\(\Leftrightarrow x-10=0\)

\(\Leftrightarrow x=10\)

Answer 2

b.

\(\dfrac{3\left(2x+1\right)}{4}-5x+\dfrac{3}{6}+\dfrac{x+1}{3}=\dfrac{x+7}{2}\)

\(\Leftrightarrow\dfrac{3.3\left(2x+1\right)-5x.12+3.2+\left(x+1\right).4}{12}=\dfrac{\left(x+7\right).6}{12}\)

\(\Leftrightarrow18x+9-60x+6+4x+4=6x+42\)

\(\Leftrightarrow18x-60x+4x-6x=42-9-6-4\)

\(\Leftrightarrow-44x=23\)

\(\Leftrightarrow\dfrac{-23}{44}\)

Hình như mình làm bị sai sai