Đáp án:

⇒ Ở dưới

Giải thích các bước giải:

m)

$M = \dfrac{-1,2 : \left(\dfrac{8}{5} \cdot \dfrac{5}{4}\right)}{\dfrac{16}{25} - \dfrac{1}{25}} + \dfrac{\left(\dfrac{27}{25} - \dfrac{2}{25}\right) \cdot \dfrac{7}{4}}{\left(\dfrac{50}{9} - \dfrac{9}{4}\right) \cdot \dfrac{36}{17}} + \dfrac{3}{5} \cdot \dfrac{1}{2} \cdot \dfrac{5}{2}$

$M = \dfrac{-1,2 : 2}{\dfrac{15}{25}} + \dfrac{1 \cdot \dfrac{7}{4}}{\dfrac{119}{36} \cdot \dfrac{36}{17}} + \dfrac{3}{4}$

$M = \dfrac{-0,6}{0,6} + \dfrac{\dfrac{7}{4}}{7} + \dfrac{3}{4}$

$M = -1 + \dfrac{1}{4} + \dfrac{3}{4}$

$M = -1 + 1 \Rightarrow M = 0$

a)

$A = \left[\left(\dfrac{4}{386} - \dfrac{3}{386}\right) \cdot \dfrac{193}{17} + \dfrac{33}{34}\right] : \left[\left(\dfrac{14}{3862} + \dfrac{11}{3862}\right) \cdot \dfrac{1931}{25} + \dfrac{9}{2}\right]$

$A = \left[\dfrac{1}{386} \cdot \dfrac{193}{17} + \dfrac{33}{34}\right] : \left[\dfrac{25}{3862} \cdot \dfrac{1931}{25} + \dfrac{9}{2}\right]$

$A = \left[\dfrac{1}{34} + \dfrac{33}{34}\right] : \left[\dfrac{1}{2} + \dfrac{9}{2}\right]$

$A = 1 : 5 \Rightarrow A = \dfrac{1}{5}$
#muzzas#