Question

Phá ngoặc rồi tính

\(\dfrac{1}{13}+\left(\dfrac{-5}{18}-\dfrac{1}{13}+\dfrac{12}{17}\right)-\left(\dfrac{12}{17}-\dfrac{5}{18}+\dfrac{7}{5}\right)\)

Answer 1

\(\dfrac{1}{13}+\left(-\dfrac{5}{18}-\dfrac{1}{13}+\dfrac{12}{17}\right)-\left(\dfrac{12}{17}-\dfrac{5}{18}+\dfrac{7}{5}\right)\)

\(=\dfrac{1}{13}-\dfrac{5}{18}-\dfrac{1}{13}+\dfrac{12}{17}-\dfrac{12}{17}+\dfrac{5}{18}-\dfrac{7}{5}\)

\(=\left(\dfrac{1}{13}-\dfrac{1}{13}\right)+\left(\dfrac{5}{18}-\dfrac{5}{18}\right)+\left(\dfrac{12}{17}-\dfrac{12}{17}\right)-\dfrac{7}{5}\)

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

Answer 2

\(=\dfrac{1}{13}+\dfrac{-5}{18}-\dfrac{1}{13}+\dfrac{12}{17}-\dfrac{12}{17}+\dfrac{5}{18}-\dfrac{7}{5}=\dfrac{-7}{5}\)

Answer 3

= 1/13 + − 5/18 − 1/13 + 12/17 − 12/17 + 5/18 − 7/5 = −7/5

TICK nha

Answer 4

\(=\dfrac{1}{13}+\dfrac{-5}{18}-\dfrac{1}{13}+\dfrac{12}{17}-\dfrac{12}{17}+\dfrac{5}{18}-\dfrac{7}{5}\)

\(=\left(\dfrac{1}{13}-\dfrac{1}{13}\right)+\left(\dfrac{-5}{18}+\dfrac{5}{18}\right)+\left(\dfrac{12}{17}-\dfrac{12}{17}\right)-\dfrac{7}{5}\)

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