\(A=\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
\(A=3-\frac{1}{4}+\frac{2}{3}-5-\frac{1}{3}+\frac{6}{5}-6+\frac{7}{4}-\frac{3}{2}\)
\(A=\left(3-5-6\right)+\left(-\frac{1}{4}+\frac{7}{4}-\frac{3}{2}\right)+\left(\frac{2}{3}-\frac{1}{3}\right)+\frac{6}{5}\)
\(A=\left(-8\right)+0+\frac{1}{3}+\frac{6}{5}\)
\(A=\left(-8\right)+\frac{1}{3}+\frac{6}{5}\)
\(A=\left(-\frac{23}{3}\right)+\frac{6}{5}\)
\(A=-\frac{97}{15}.\)
Chúc bạn học tốt!