A = 1/3 + 3/8 - 7/12; B = -3/14 + 5/8 - 1/2; C = 1/4 - 2/3 - 11/18; D = 1/4 + 5/12 - 1/13 - 7/8

Các bn giúp mk với, mk cần gấp lắm :
$$\begin{gathered} A= \frac{1}{3}+ \frac{3}{8}-\frac{7}{12} ; B = \frac{-3}{14}+\frac{5}{8}-\frac{1}{2} ; C = \frac{1}{4}-\frac{2}{3}-\frac{11}{18} \\ D = \frac{1}{4}+\frac{5}{12}-\frac{1}{13}-\frac{7}{8} \end{gathered}$$
Cảm ơn mấy bn nhìu lắm !!!