Question

thực hiện phép tính 

(−1/4 +7/33 −5/3 )−(−15/12 +6/11 −48/49 )

 

Answer 1

=\(-\frac{1}{4}+\frac{7}{33}-\frac{5}{3}+\frac{15}{12}-\frac{6}{11}+\frac{48}{49}=\left(-\frac{1}{4}-\frac{5}{3}+\frac{15}{12}\right)+\left(\frac{7}{33}-\frac{6}{11}\right)+\frac{48}{49}\)

\(=\left(\frac{-3}{12}-\frac{20}{12}+\frac{15}{12}\right)+\left(\frac{7}{33}-\frac{18}{33}\right)+\frac{48}{49}\)

\(=-\frac{8}{12}+\frac{-11}{33}+\frac{48}{49}=-\frac{2}{3}-\frac{1}{3}+\frac{48}{49}=-\frac{3}{3}+\frac{48}{49}=-1+\frac{48}{49}=-\frac{49}{49}+\frac{48}{49}=-\frac{1}{49}\)