Question

55 PONTOS
Efetue (frações):

7/12 - 4/9 =

3 - 17/24 =

13/18 - 5/24 - 1/36 =

13/15 - 13/24 =

27/14 - 1 =

Answer 1

Resposta:

$\dfrac{7}{12} - \dfrac{4}{9} = \dfrac{21}{36}-\dfrac{16}{36}=\boxed{\dfrac{5}{36}}$

$3 - \dfrac{17}{24} = \dfrac{72}{24}-\dfrac{17}{24}=\boxed{\dfrac{55}{24}}$

$\dfrac{13}{18} - \dfrac{5}{24} - \dfrac{1}{36} = \dfrac{52}{72}-\dfrac{15}{72}-\dfrac{2}{72}=\boxed{\dfrac{35}{72}}$

$\dfrac{13}{15} - \dfrac{13}{24} = \dfrac{104}{120}-\dfrac{65}{120}=\dfrac{39^{:3}}{120^{:3}}=\boxed{\dfrac{13}{40}}$

$\dfrac{27}{14} - 1 = \dfrac{27}{14}-\dfrac{14}{14}=\boxed{\dfrac{13}{14}}$

Explicação passo-a-passo:

Answer 2

Resposta:

Explicação passo-a-passo:

.

a). 7/12 - 4/9 = ...(m.m.c. =. 36)

.....21/36 - 16/36 =

.....(21 - 16)/36 = 5/36

.

b).. 3 - 17/24 = ...(m.m.c. = 24)

.......72/24 - 17/24 =

.......(72 - 17) = 55/24

.

c)..13/18 - 5/24 - 1/36 = ...(m.m.c. = 72)

.....52/72 - 15/72 - 2/72 =

....(52 - 15 - 2) = 35/72

.

d)..13/15 - 13/24 = ....(m.m.c = 120)

.....104/120 - 65/120 =

.....(104 - 65)/120 = 39/120 = 13/40

.

e)..27/14 - 1 = ...(m.m.c. = 14)

.....27/14 - 14/14 =

.....(27 - 14)/14 = 13/14

.

(Espero ter colaborado)