Cứu mị :(((((((((((((((
a)\(-\dfrac{2}{15}-x=-\dfrac{3}{10}\)
\(x=\left(-\dfrac{2}{15}\right)-\left(\dfrac{-3}{10}\right)\)
\(x=\left(-\dfrac{2}{15}\right)+\dfrac{3}{10}\)
\(x=\dfrac{1}{6}\)
a, \(\dfrac{-2}{15}-x=\dfrac{-3}{10}\)=> x=\(\dfrac{-2}{15}-\dfrac{-3}{10}=>x=\dfrac{1}{6}\)
b,\(\left(\dfrac{2x}{5}-1\right):\left(-5\right)=\dfrac{1}{4}\)
=> \(\dfrac{2x}{5}-1=\dfrac{1}{4}.\left(-5\right)\)=> \(\dfrac{2x}{5}-1=\dfrac{-5}{4}=>\dfrac{2x}{5}=\dfrac{-1}{4}=>\dfrac{8x}{20}=\dfrac{-5}{20}\)=>x=\(\dfrac{-5}{8}\)
c, \(2\dfrac{1}{4}x-9\dfrac{1}{4}=20=>\dfrac{9}{4}x-\dfrac{37}{4}=20\)=>\(\dfrac{9}{4}x=20+\dfrac{37}{4}=>\dfrac{9}{4}x=\dfrac{117}{4}=>x=13\)
d, \(\dfrac{3}{7}+\dfrac{1}{7}:x=\dfrac{3}{14}\)=> \(\dfrac{1}{7}:x=\dfrac{3}{7}-\dfrac{3}{14}=>\dfrac{1}{7}:x=\dfrac{3}{14}=>x=\dfrac{2}{3}\)
e, \(\dfrac{-15}{12}x+\dfrac{3}{7}=\dfrac{6}{5}x-\dfrac{1}{2}\)
=>\(\dfrac{-15}{12}x-\dfrac{6}{5}x=\dfrac{-1}{2}-\dfrac{3}{7}\)=>\(x.\left(\dfrac{-15}{12}-\dfrac{6}{5}\right)=\dfrac{-13}{14}\)
=>\(x.\dfrac{-49}{20}=\dfrac{-13}{14}=>x=\dfrac{130}{343}\)
Còn bài g thì mk k bt, hình như sai đề....
a=1/6
b=-5/8
c=89/2
d=-2/3
e=130/343
g=x là 1 phân số
