Question

tính rồi rút gọn : 3/4 + 5/7
4/5 x 5/7

Answer 1

3/4 + 5/7=41/28
4/5 x 5/7=4/7

Answer 2

\(\dfrac{3}{4}+\dfrac{5}{7}=\dfrac{21}{28}+\dfrac{20}{28}=\dfrac{41}{28}\)

 

\(\dfrac{4}{5}\times\dfrac{5}{7}=\dfrac{4\times5}{5\times7}=\dfrac{20}{35}=\dfrac{4}{7}\)

Answer 3

\(\dfrac{3}{4}+\dfrac{5}{7}=\dfrac{21}{28}+\dfrac{20}{28}=\dfrac{41}{28}\)

\(\dfrac{4}{5}\times\dfrac{5}{7}=\dfrac{4}{7}\)

Answer 4

3/4 + 5/7=41/28
4/5 x 5/7=4/7