Đáp án:
$(3-2$$\dfrac{1}{3}$ $+$$\dfrac{1}{4}$ $) : (4-5$$\dfrac{1}{6}$ $+ 2$$\dfrac{1}{4}$)
$= (3-$$\dfrac{7}{3}$ $+$ $\dfrac{1}{4}$$) : (4-$$\dfrac{31}{6}$ $+$ $\dfrac{9}{4}$)
$= ($$\dfrac{3.12-7.4+1.3)}{12}$ $:$ ($\dfrac{4.24-31.4+9.6)}{24}$
$= ($$\dfrac{11}{12}$$) : ($$\dfrac{26}{24}$)
$=$ $\dfrac{11}{12}$ $.$ $\dfrac{24}{26}$
$= $$\dfrac{11}{13}$
BẠN THAM KHẢO NHA!!!