27/23 + 5/21 - 4/23 + 6/21 + 1/2
=( 27/23 - 4/23 ) + ( 5/21 + 6/21 ) + 1/2
= 23/23 + 11/21 + 1/2
= 1 + 11/21 + 1/2
= 32/21 + 1/2
= 85/42
\(\frac{27}{23}+\frac{5}{21}-\frac{4}{23}+\frac{6}{21}+\frac{1}{2}\)
\(=(\frac{27}{23}-\frac{4}{23})+(\frac{5}{21}+\frac{6}{21})+\frac{1}{2}\)
\(=1+\frac{11}{21}+\frac{1}{2}\)
\(=\frac{32}{21}+\frac{1}{2}=\frac{85}{42}\)
Chúc bạn học tốt
\(\frac{27}{23}+\frac{5}{21}-\frac{4}{23}+\frac{6}{21}+\frac{1}{2}\)
\(=\left(\frac{27}{23}-\frac{4}{23}\right)+\left(\frac{5}{21}+\frac{6}{21}\right)+\frac{1}{2}\)
\(=\frac{23}{23}+\frac{11}{21}+\frac{1}{2}\)
\(=1+\frac{11}{21}+\frac{1}{2}\)
\(=\frac{21}{21}+\frac{11}{21}+\frac{1}{2}\)
\(=\frac{32}{21}+\frac{1}{2}=\frac{64}{42}+\frac{21}{42}=\frac{85}{42}\)
