Tính giấ trị biểu thức :
A= [ ( 6\(\frac{3}{5}\) - 3 \(\frac{3}{14}\) ) . ( 5\(\frac{5}{6}\) ) : [ ( 21 - 1,25 ) : 2, 5
B= \(\frac{0,125-\frac{1}{5}+\frac{1}{7}}{0,375-\frac{3}{5}+\frac{3}{7}}+\frac{\frac{1}{2}+\frac{1}{3}-0,2}{\frac{3}{4}+0,5-\frac{3}{10}}\)
C = \(\frac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\)
A = 1/25
B = 1
C = 4/5