1/2+3/4*1/3 2/3+1/2-5/12
=1/2+1/4 =7/6-5/12
=3/4 =3/4
\(\text{Giải:}\)
\(\frac{1}{2}+\frac{3}{4}.\frac{1}{3}=\frac{1}{2}+\frac{3}{12}=\frac{6}{12}+\frac{3}{12}\)\(=\frac{9}{12}\)
\(\frac{2}{3}+\frac{1}{2}-\frac{5}{12}=\frac{8}{12}+\frac{6}{12}-\frac{5}{12}\)\(=\frac{9}{12}\)
\(\text{Học tốt!!!}\)
a)\(\frac{1}{2}+\frac{3}{4}.\frac{1}{3}=\frac{1}{2}+\frac{3.1}{4.3}\)
\(=\frac{1}{2}+\frac{1}{4}\)
\(=\frac{2}{4}+\frac{1}{4}=\frac{3}{4}\)
b)\(\frac{2}{3}+\frac{1}{2}-\frac{5}{12}=\frac{8}{12}+\frac{6}{12}-\frac{5}{12}\)
\(=\frac{9}{12}=\frac{3}{4}\)
Chúc bạn học tốt
\(\frac{1}{2}+\frac{3}{4}\times\frac{1}{3}=\frac{7}{12}\)
\(\frac{2}{3}+\frac{1}{2}-\frac{5}{12}=\frac{3}{4}\)