Rút gọn phân số a. 48/64 - 5/8 b. 3/5 - 8/20 c. 21/27 - 2/9 d. 24/16 - 1/2

a. \(\frac{48}{64} - \frac{5}{8} = \frac{3}{4} - \frac{5}{8} = \frac{6}{8} - \frac{5}{8} = \frac{1}{8}\) b. \(\frac{3}{5} - \frac{8}{20} = \frac{12}{20} - \frac{8}{20} = \frac{4}{20} = \frac{1}{5}\) c. \(\frac{21}{27} - \frac{2}{9} = \frac{7*3}{9*3}-\frac {2*3 } {9*3}=  \) \(= \) \(=\dfrac {21-6 } {27}= \dfrac {15 } {27}= \dfrac {5 } {9}\) d. \(\dfrac {24 } {16}-\dfrac {1 } {2}= \dfrac {24*2-16*1 }  {(16)(2)}= \dfract 48-16 ) 32= \dfract 32 ) 32=1\)