\(a,=\dfrac{12+8+19}{17}=\dfrac{39}{17}\\ b,=\dfrac{2}{5}+\left(\dfrac{7+13}{12}\right)\\ =\dfrac{2}{5}+\dfrac{5}{6}\\ =\dfrac{2.6+5.5}{30}\\ =\dfrac{3}{2}\)
Đúng 1
Bình luận (0)
a) \(\dfrac{12}{17}+\dfrac{19}{17}+\dfrac{8}{17}\)
\(=\dfrac{12+19+8}{17}\)
\(=\dfrac{39}{17}\)
b) \(\dfrac{2}{5}+\dfrac{7}{12}+\dfrac{13}{12}\)
\(=\dfrac{2}{5}+\dfrac{7+13}{12}\)
\(=\dfrac{2}{5}+\dfrac{20}{12}\)
\(=\dfrac{2}{5}+\dfrac{5}{3}\)
\(=\dfrac{6}{15}+\dfrac{25}{15}\)
\(=\dfrac{31}{15}\)
Đúng 1
Bình luận (0)
