XIN CÂU TRẢ LỜI HAY NHẤT, mất thời gian lắm đó, công thức latex rắc rối lắm
1) -$\frac{3}{7}$ + x =$\frac{1}{3}$
⇔ x = $\frac{1}{3}$ + $\frac{3}{7}$
⇔ x= $\frac{16}{21}$
2) $\frac{5}{8}$ +x= ($\frac{-2}{3}$)²
⇔$\frac{5}{8}$+x=$\frac{4}{9}$
⇔x=$\frac{4}{9}$-$\frac{5}{8}$
⇔x=$\frac{-13}{72}$
3) $\frac{3}{5}$x+$\frac{2}{3}$=$\frac{4}{5}$
⇔$\frac{3}{5}$x=$\frac{4}{5}$-$\frac{2}{3}$=$\frac{2}{15}$
⇔x=$\frac{2}{15}$ : $\frac{3}{5}$=$\frac{2}{9}$
4) $\frac{-11}{2}$x+0,25=$\frac{5}{6}$
⇔$\frac{-11}{2}$x=$\frac{5}{6}$-0,25=$\frac{7}{12}$
⇔x=$\frac{7}{12}$ : $\frac{-11}{2}$=$\frac{-7}{66}$
5) $\frac{12}{x}$=$\frac{3}{4}$
⇔12 × 4=3 × x
⇔48=3x
⇔x=48:3=16
6) x : 3$\frac{1}{3}$=6 : 15
⇔x : $\frac{10}{3}$=$\frac{2}{5}$
⇔x=$\frac{2}{5}$ × $\frac{10}{3}$=$\frac{4}{3}$
7)|3x-1|=2
⇔\(\left[ \begin{array}{l}3x-1=2\\3x-1=-2\end{array} \right.\)
⇔\(\left[ \begin{array}{l}3x=3\\3x=-1\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=1\\x=\frac{-1}{3}\end{array} \right.\)
8) |$\frac{1}{4}$+x|-$\frac{1}{3}$=$\frac{2}{5}$
⇔|$\frac{1}{4}$+x|=$\frac{2}{5}$+$\frac{1}{3}$=$\frac{11}{15}$
⇔\(\left[ \begin{array}{l}\frac{1}{4}+x=\frac{11}{15}\\\frac{1}{4}+x=\frac{-11}{15}\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=\frac{29}{60}\\x=\frac{-59}{60}\end{array} \right.\)
