Bạn tham khảo :
$M = \dfrac{-1}{3}. \dfrac{141}{17} - \dfrac{39}{3}. \dfrac{-1}{17}$
$M= \dfrac{-1}{17}. \dfrac{141}{3} - \dfrac{39}{3} . \dfrac{-1}{17}$
$M = \dfrac{-1}{17}(\dfrac{141}{3} - \dfrac{39}{3})$
$M = \dfrac{-1}{17} ( 47 - 13)$
$M = \dfrac{-1}{17}.34$
$M = \dfrac{-1.34}{17}$
$M = \dfrac{-34}{17}$
$M = -2$
$N = \dfrac{-9}{16} . \dfrac{13}{3} - (\dfrac{-3}{4})^2 . \dfrac{19}{3}$
$N = \dfrac{-9}{16} . \dfrac{13}{3} - \dfrac{9}{16} . \dfrac{19}{3}$
$N = \dfrac{-9}{16}( \dfrac{13}{3} - \dfrac{19}{3})$
$N = \dfrac{-9}{16} . \dfrac{-32}{3}$
$N = \dfrac{-9 . (-32)}{16.3}$
$N = \dfrac{-3 . 2}{1.1}$
$N= \dfrac{-6}{1}$
$N = (-6)$
