Question

D) 13/4 - 9/8

E)8/15 + 9/10

OBS: com MMC

Answer 1

d)

4,8|2

2,4|2

1,4|2

1,2|2

1,1

mmc(4,8)=8

$\frac{13}{4}-\frac{9}{8}=\frac{26}{8}-\frac{9}{8}=\frac{17}{8}$

e)

15,10|2

15,5|3

 5,5|5

  1,1

mmc(15,10)=30

$\frac{8}{15}+\frac{9}{10}=\frac{16}{30}-\frac{27}{30}=-\frac{11}{30}$

Answer 2

Explicação passo-a-passo:

D)

$\dfrac{13}{4} - \dfrac{9}{8}$

$mmc (4 \: e \: \: 8)= > 8$

$\dfrac{26 - 8}{8}$

$\dfrac{17}{8}$

E)

$\dfrac{8}{15} + \dfrac{9}{10}$

$mmc \: \: de \: \: (15 \: \: e \: \: 10) = > 30$

$\dfrac{16 + 27}{30}$

$\dfrac{43}{30}$