Question

Answer 1

Answer 2

bài 6: 

a.2

b.3

Answer 3

a) \(\dfrac{8}{27}+\dfrac{4}{15}+\dfrac{19}{27}+\dfrac{11}{15}=\left(\dfrac{8}{27}+\dfrac{19}{27}\right)+\left(\dfrac{4}{15}+\dfrac{11}{15}\right)=\dfrac{27}{27}+\dfrac{15}{15}=1+1=2\)

b) \(\dfrac{12}{13}+\dfrac{2}{7}+\dfrac{8}{13}+\dfrac{6}{13}+\dfrac{5}{7}=\left(\dfrac{12}{13}+\dfrac{8}{13}+\dfrac{6}{13}\right)+\left(\dfrac{2}{7}+\dfrac{5}{7}\right)=\dfrac{26}{13}+\dfrac{7}{7}=2+1=3\)

Answer 4

a: \(\dfrac{8}{27}+\dfrac{4}{15}+\dfrac{19}{27}+\dfrac{11}{15}=1+1=2\)

b: \(\dfrac{12}{13}+\dfrac{2}{7}+\dfrac{8}{13}+\dfrac{6}{13}+\dfrac{5}{7}=2+1=3\)