\(\frac{1}{2}\div\frac{3}{4}+\frac{1}{6}\div\frac{3}{4}\)
\(=\frac{3}{4}\div\left(\frac{1}{2}+\frac{1}{6}\right)\)
\(=\frac{3}{4}\div\frac{2}{3}\)
\(=\frac{9}{8}\)
\(\frac{1}{2}\div\frac{3}{4}-\frac{1}{6}\div\frac{3}{4}\)
\(=\left(\frac{1}{2}-\frac{1}{6}\right)\div\frac{3}{4}\)
\(=\frac{1}{3}\div\frac{3}{4}\)\
\(=\frac{4}{9}\)
1/2 : 3/4 + 1/6 : 3/4 = 1/2 x 4/3 + 1/6 x 4/3 = 4/3 x (1/2 + 1/6) = 4/3 x 2/3 = 8/9
1/2 : 3/4 - 1/6 : 3/4 = 1/2 x 4/3 - 1/6 x 4/3 = 4/3 x (1/2 - 1/6) = 4/3 x 1/3 = 4/9
1/2 : 3/4 + 1/6 : 3/4 1/2 : 3/4 - 1/6 : 3/4
= ( 1/2 + 1/6 ) : 3/4 = ( 1/2 - 1/6 ) : 3/4
= 2/3 : 3/4 = 1/3 : 3/4
= 8/9 = 4/9
Chúc bạn hok tốt!