Question

1- 2/3 + 1/7
2- 1/3 - 1/12
3- 1/9 + 1/10
4- 1/4 - 1/9
5- 1/3 - 1/10
Todas as contas armadas e resolvidas

Answer 1

Resolução!

1 ) ==============================================

= 2/3 + 1/7 __ MMC = 21

= 14 + 3/21

= 17/21

2)=================================

= 1/3 - 1/7 _______ MMC = 12

= 4 - 1/12

= 3/12 ÷ 3

= 1/4

3 )========================================

= 1/9 + 1/10 ______ MMC = 90

= 10 + 9/90

= 19/90

4 ) ==================================

= 1/4 - 1/9 ____ MMC = 36

= 9 - 4/36

= 5/36

5 )==================================

= 1/3 - 1/10 ____ MMC = 30

= 10 - 3/30

= 7/30

Espero ter ajudado

Answer 2

Explicação passo-a-passo:

Resolução!!!

1)

$\dfrac{2}{3} + \dfrac{1}{7}$

Mmc de 3 e 7=>21

$\dfrac{14 + 3}{21}$

17/21

2)

$\dfrac{1}{3} - \dfrac{1}{12}$

Mmc de 3 e 12=>12

$\dfrac{4 - 1}{12}$

$\dfrac{3}{12}$

$\dfrac{3 {}^{ \div 3} }{12 {}^{ \div 3} }$

1/4

3)

$\dfrac{1}{9} + \dfrac{1}{10}$

Mmc de 9 e 10=>90

$\dfrac{10 + 9}{90}$

19/90

4)

$\dfrac{1}{4} - \dfrac{1}{9}$

Mmc de 4 e 9=>36

$\dfrac{9 - 4}{36}$

5/36

5)

$\dfrac{1}{3} - \dfrac{1}{10}$

Mmc de 3 e 10=>30

$\dfrac{10 - 3}{30}$

7/30

Espero ter ajudado!