Question

Tính 1 cách hợp lí

\(A=\dfrac{-1}{9}+\dfrac{3}{7}+\dfrac{3}{9}+\dfrac{6}{7}\)

Answer 1

\(A=\dfrac{-1}{9}+\dfrac{3}{9}+\dfrac{3}{7}+\dfrac{6}{7}=\dfrac{2}{9}+\dfrac{9}{7}=\dfrac{14+81}{63}=\dfrac{95}{63}\)

Answer 2

Refer

Answer 3

\(A=\dfrac{-1}{9}+\dfrac{3}{7}+\dfrac{3}{9}+\dfrac{6}{7}\)

\(\Rightarrow A=\left(\dfrac{-1}{9}+\dfrac{3}{9}\right)+\left(\dfrac{3}{7}+\dfrac{6}{7}\right)\)

\(\Rightarrow A=\dfrac{2}{9}+\dfrac{9}{7}\)

\(\Rightarrow A=\dfrac{14}{63}+\dfrac{81}{63}\)

\(\Rightarrow A=\dfrac{95}{63}\)

Answer 4

95/63