Question

3+\(\dfrac{2}{5}\)=

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

1-(\(\dfrac{2}{5}\)+\(\dfrac{1}{3}\)) =

Answer 1

\(\dfrac{3\times5}{1\times5}+\dfrac{2}{5}=\dfrac{15}{5}+\dfrac{2}{5}=\dfrac{17}{5}\\ \dfrac{4\times7}{1\times7}-\dfrac{5}{7}=\dfrac{28}{7}-\dfrac{5}{7}=\dfrac{23}{7}\\ 1-\left(\dfrac{2\times3}{5\times3}+\dfrac{1\times5}{3\times5}\right)=1-\left(\dfrac{6}{15}+\dfrac{5}{15}\right)\\ =\dfrac{1\times15}{1\times15}-\dfrac{11}{15}=\dfrac{15}{15}-\dfrac{11}{15}=\dfrac{4}{15}\)

Answer 2

\(\dfrac{17}{5}\)

\(\dfrac{23}{7}\)

\(\dfrac{4}{15}\)

Answer 3

3+7=21/7

1-(2/1/3) = 4/15

Answer 4

Mik cám ơn các bẹn ❤❤❤

Answer 5

23/7