Đáp án:
a) x= $\frac{10}{3}$
b) x= \(\left[ \begin{array}{l}x=1\\x=-1/3\end{array} \right.\)
c) x= $\frac{6}{15}$
d) x= $\frac{3}{2}$
Giải thích các bước giải:
a) $\frac{3}{5}$x+$\frac{2}{3}$= 2$\frac{2}{3}$
⇔ $\frac{3}{5}$x= $\frac{8}{3}$ - $\frac{2}{3}$
⇔ x= 2 : $\frac{3}{5}$= $\frac{10}{3}$
b) 5- |3x-1| = 3
⇔ |3x-1|=2
⇔ \(\left[ \begin{array}{l}3x-1=2\\3x-1=-2\end{array} \right.\)
⇔ \(\left[ \begin{array}{l}x=1\\x=-1/3\end{array} \right.\)
c) 0,3x : 3$\frac{1}{3}$ = $\frac{6}{15}$
⇔$\frac{3}{10}$x. $\frac{10}{3}$= $\frac{6}{15}$
⇔ x= $\frac{6}{15}$
d) 9(x-1)² -$\frac{4}{9}$:$\frac{2}{9}$= $\frac{1}{4}$
⇔ 9(x-1)² -2= $\frac{1}{4}$
⇔ (x-1)² = $\frac{1}{4}$
⇔ x-1= = $\frac{1}{2}$
⇔ x = $\frac{3}{2}$
