Question

lèm hụ mik vs 

Answer 1

ét o ét

Answer 2

ét o ét

Answer 3

bài 2 :

a) -8/3 . 15/24 = -5/3

b) -2/9 . 5/-9 = 16/81

c) (-5) . 8/15 = -8/3

d) -2/9 . 4 1/2 = -2/9 . 9/2 = -1

bài 3 : 

a) -5/6 : 3/13 = -65/18

b) 5/9 : 5/-3 = -1/3

c) -15 : 3/2 = -10

d) 3/4 : (-9) = -1/12

Answer 4

Bài 2:

\(a,\dfrac{-8}{3}.\dfrac{15}{24}=\dfrac{-8.15}{3.24}=\dfrac{-120}{72}=\dfrac{-10}{6}=\dfrac{-5}{3}\)

\(b,\dfrac{-2}{9}.\dfrac{5}{-9}=\dfrac{-2.5}{9.\left(-9\right)}=\dfrac{-10}{-81}=\dfrac{10}{81}\)

\(c,\left(-5\right).\dfrac{8}{-15}=\dfrac{-5.8}{-15}=\dfrac{-40}{-15}=\dfrac{-8}{-3}=\dfrac{8}{3}\)

\(d,\dfrac{-2}{9}.4\dfrac{1}{2}=\dfrac{-2}{9}.2=\dfrac{-2.2}{9}=\dfrac{-4}{9}\)

 

Answer 5

Bài 3:

\(a,\dfrac{-5}{6}:\dfrac{3}{13}=\dfrac{-5.13}{6.3}=\dfrac{-65}{18}\)

\(b,\dfrac{5}{9}:\dfrac{5}{-3}=\dfrac{5.\left(-3\right)}{9.5}=\dfrac{-15}{40}=\dfrac{-3}{8}\)

\(c,-15:\dfrac{3}{2}=\dfrac{-15.2}{3}=\dfrac{-30}{3}=-10\)

\(d,\dfrac{3}{4}:\left(-9\right)=\dfrac{3}{4.\left(-9\right)}=\dfrac{3}{-36}=\dfrac{1}{-12}=\dfrac{-1}{12}\)