Question

4 phần 5 cộng 7 phần 10 trừ 1 phần 2

Answer 1

\(\dfrac{4}{5}\)+\(\dfrac{7}{10}\) -\(\dfrac{1}{2}\) 

 Giữ nguyên phân số \(\dfrac{7}{10}\)  ( MSC: 10)

\(\dfrac{4}{5}\)= \(\dfrac{4x2}{5x2}\) =\(\dfrac{8}{10}\)

\(\dfrac{1}{2}\) = \(\dfrac{1x5}{2x5}\) = \(\dfrac{5}{10}\) 

\(\dfrac{4}{5}\)+\(\dfrac{7}{10}\) -\(\dfrac{1}{2}\) = \(\dfrac{8}{10}\) +\(\dfrac{7}{10}\) -\(\dfrac{5}{10}\) =1

 

Answer 2

không biết ?

Answer 3

10.4