Question

tính nhanh
(-1/3)-3/4-(-1/5)-1/4+4/5+1/3

Answer 1

\(\left(-\dfrac{1}{3}\right)-\dfrac{3}{4}-\left(-\dfrac{1}{5}\right)-\dfrac{1}{4}+\dfrac{4}{5}+\dfrac{1}{3}\)

\(=\left[\left(-\dfrac{1}{3}\right)+\dfrac{1}{3}\right]-\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)\)

\(=0-\dfrac{4}{4}+\dfrac{5}{5}\)

\(=0-1+1\)

\(=0\)

Answer 2

=-1/3+1/3-3/4-1/4+1/5+4/5

=-1+1

=0