a)3/4x-1/3=-5/2
3/4x =-5/2+1/3
3/4x =-1/12
x =-1/12:3/4
x =-1/9
b)2 1/3:x=-4/5
7/3:x =-4/5
x =7/3:-4/5
x =-35/12
c)x-4/5=3/10
x =3/10+4/5
x =11/10
Chúc bạn hok tốt
x-4/5 = 3/10
=> 10(x - 4) = 5.3
=> 10x - 40 = 15
=> 10x = 55
=> x = 5,5
\(\frac{3}{4}x-\frac{1}{3}=\frac{-5}{12}\)
\(\frac{3}{4}x=\frac{-5}{12}+\frac{1}{3}\)
\(\frac{3}{4}x=\frac{-1}{12}\)
\(x=\frac{-1}{12}:\frac{3}{4}\)
\(x=\frac{-1}{9}\)
\(2\frac{1}{3}:x=\frac{-4}{5}\)
\(\frac{7}{3}:x=\frac{-4}{5}\)
\(x=\frac{7}{3}:\frac{-4}{5}\)
\(x=\frac{-35}{12}\)
\(x-\frac{4}{5}=\frac{3}{10}\)
\(x=\frac{3}{10}+\frac{4}{5}\)
\(x=\frac{11}{10}\)
