\(1\dfrac{1}{5}+1\dfrac{2}{4}=\dfrac{6}{5}+\dfrac{6}{4}=\dfrac{24}{20}+\dfrac{30}{20}=\dfrac{54}{40}\)
Cách chuyển hỗn số thành phân số :
\(1\dfrac{1}{5}=\dfrac{1x5+1}{5}=\dfrac{6}{5}\)
\(1\dfrac{2}{4}=\dfrac{1x4+2}{4}\dfrac{6}{4}\)
\(1\dfrac{1}{5}+1\dfrac{2}{4}=\dfrac{6}{5}+\dfrac{3}{2}=\dfrac{6\times2}{5\times2}+\dfrac{3\times5}{2\times5}=\dfrac{12}{10}+\dfrac{15}{10}=\dfrac{12+15}{10}=\dfrac{27}{10}.\)