Question

tinh nhanh  

A = ( 7 - 3/4 + 1/3) - ( -6 + 5/4 - 4/3) -( 13 - 7/4 + 5/3)

Answer 1

\(A=\left(7-\frac{3}{4}+\frac{1}{3}\right)-\left(-6+\frac{5}{4}-\frac{4}{3}\right)-\left(13-\frac{7}{4}+\frac{5}{3}\right)\)

\(A=7-\frac{3}{4}+\frac{1}{3}+6-\frac{5}{4}+\frac{4}{3}-13+\frac{7}{4}-\frac{5}{3}\)

\(A=\left(7+6-13\right)+\left(-\frac{3}{4}-\frac{5}{4}+\frac{7}{4}\right)+\left(\frac{1}{3}+\frac{4}{3}-\frac{5}{3}\right)\)

\(A=0-\frac{1}{4}+0=-\frac{1}{4}\)

Nếu có sai sót mong bn thông cảm nha