Question

71. Efetue os cálculos e simplifique o resultado
quando possível​

Answer 1

Oie, Td Bom?!

a)

= 69/70 . 52/18

= 69/70 . 26/9

= 23/70 . 26/3

= 23/35 . 13/3

= 299/105

b)

= 81/52 . 26/117

= 81/2 . 1/117

= 9/2 . 1/13

= 9/26

c)

= 9/28 . 49/15

= 3/28 . 49/5

= 3/4 . 7/5

= 21/20

d)

= 9/35 . 30/9

= 1/35 . 30

= 1/7 . 6

= 6/7

e)

= 84/165 . 7/12 . 99/189

= 7/165 . 7 . 99/189

= 7/165 . 99/27

= 7/5 . 3/27

= 7/5 . 1/9

= 7/45

f)

= 7 . 69/70 . 52/18

= 69/10 . 52/18

= 69/10 . 26/9

= 23/10 . 26/3

= 23/5 . 13/3

= 299/15

Att. Makaveli1996

Answer 2

Vamos lá !!

• Letra A

$= \frac{69}{70} \times \frac{52}{18}$

$= \frac{3588}{1260}$

$= \frac{3588}{1260} \div 12$

$\red{ = \frac{299}{105}}$

• Letra B

$= \frac{81}{52} \times \frac{26}{117}$

$= \frac{2106}{6084}$

$= \frac{2106}{6084} \div 234$

$\red{ = \frac{9}{26}}$

• Letra C

$= \frac{9}{28} \times \frac{49}{15}$

$= \frac{441}{420}$

$= \frac{441}{420} \div 21$

$\red{ = \frac{21}{20} }$

• Letra D

$= \frac{9}{35} \times \frac{30}{9}$

$= \frac{270}{315}$

$= \frac{270}{315} \div 45$

$\red{ = \frac{6}{7}}$

• Letra E

$= \frac{84}{165} \times \frac{7}{12} \times \frac{99}{189}$

$= \frac{58.212}{374.220}$

$= \frac{58.212}{374.220} \div 8.316$

$\red{ = \frac{7}{45}}$

• Letra F

$= \frac{7}{1} \times \frac{69}{70} \times \frac{52}{18}$

$= \frac{25.116}{1.260}$

$= \frac{25.116}{1.260} \div 84$

$\red{ = \frac{299}{15} }$

Bons estudos .