Question

a, 6/7 - 4/21 

b, 6 x 12/18

c, 2/5 x 3/7 + 2/5 x 4/7

giúp tui nhe 

Answer 1

\(a.\dfrac{6}{7}-\dfrac{4}{21}=\dfrac{18-4}{21}=\dfrac{14}{21}=\dfrac{2}{3}\\ b.6\times\dfrac{12}{18}=\dfrac{6\times12}{18}=\dfrac{4}{1}=4\\ c.\dfrac{2}{5}\times\dfrac{3}{7}+\dfrac{2}{5}\times\dfrac{4}{7}-\left(\dfrac{3}{7}+\dfrac{4}{7}\right)\times\dfrac{2}{5}=\dfrac{7}{7}\times\dfrac{2}{5}=1\times\dfrac{2}{5}=\dfrac{2}{5}\)

Answer 2

18/21 - 4/21 = 14/21 = 2/3

(3/7+4/7)x 2/5= 7/7x 2/5 = 1x2/5 = 2/5