Question

7/15 + 4/5    b 2/3- 3/8     c 4/7 x 21/16 chia 5/8                                        13x42x11/33x26x35         tinh bang cach nhanh nhat

s0s sos 

giup minh voi

 

 

 

 

 

 

 

 

 

Answer 1

\(\dfrac{7}{15}+\dfrac{4}{5}=\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{19}{15}\)

\(\dfrac{2}{3}-\dfrac{3}{8}=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)

\(\dfrac{4}{7}.\dfrac{21}{16}:\dfrac{5}{8}=\dfrac{4}{7}.\dfrac{21}{16}.\dfrac{8}{5}=\dfrac{4.3.7.4.2}{7.4.4.5}=\dfrac{6}{5}\)

Answer 2

giup minh voi minh can gap lam

 

Answer 3

thieu ban huong oi con 1 cau nua ma