Question

a) 5/2 . ( x + 2) - 10/3 = 1/6

b)1/3 . ( 3x . 2) + 25% = (-9/6)

c) ( x - 1) : 4/3 + 9/16 = (-5)^2/ 4^2

d) x+2 /3 = -12/7

Answer 1

a.

\(\dfrac{5}{2}\left(x+2\right)-\dfrac{10}{3}=\dfrac{1}{6}\)

\(\dfrac{5}{2}\left(x+2\right)=\dfrac{1}{6}+\dfrac{10}{3}\)

\(\dfrac{5}{2}\left(x+2\right)=\dfrac{7}{2}\)

\(x+2=\dfrac{7}{2}:\dfrac{5}{2}\)

\(x+2=\dfrac{7}{5}\)

\(x=\dfrac{7}{5}-2\)

\(x=-\dfrac{3}{5}\)

Answer 2

Câu b giữa 3x và 2 là dấu gì vậy em?

c.

\(\left(x-1\right):\dfrac{4}{3}+\dfrac{9}{16}=\dfrac{\left(-5\right)^2}{4^2}\)

\(\left(x-1\right):\dfrac{4}{3}+\dfrac{9}{16}=\dfrac{25}{16}\)

\(\left(x-1\right):\dfrac{4}{3}=\dfrac{25}{16}-\dfrac{9}{16}\)

\(\left(x-1\right):\dfrac{4}{3}=1\)

\(x-1=1\times\dfrac{4}{3}\)

\(x-1=\dfrac{4}{3}\)

\(x=1+\dfrac{4}{3}\)

\(x=\dfrac{7}{3}\)

Answer 3

d.

\(x+\dfrac{2}{3}=-\dfrac{12}{7}\)

\(x=-\dfrac{12}{7}-\dfrac{2}{3}\)

\(x=-\dfrac{50}{21}\)