Question

\(\dfrac{16}{21}\) + \(\dfrac{6}{7}\)  ; \(\dfrac{15}{22}\) x \(\dfrac{11}{35}\) ; \(\dfrac{8}{11}\) : \(\dfrac{5}{22}\) ; \(\dfrac{9}{13}\) : \(\dfrac{27}{39}\) .

Answer 1

`# \text {DNamNgV}`

`16/21 + 6/7`

`= 16/21 + 18/21`

`= 34/21`

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`15/22 \times 11/35`

`= (15 \times 11)/(22 \times 35)`

`= (5 \times 3 \times 11)/(2 \times 11 \times 5 \times 7)`

`= (3 \times 1)/(2 \times 7)`

`= 3/14`

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`8/11 \div 5/22`

`= 8/11 \times 22/5`

`= (8 \times 22)/(11 \times 5)`

`= (8 \times 11 \times 2)/(11 \times 5)`

`= (8 \times 2)/5`

`= 16/5`

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`9/13 \div 27/39`

`= 9/13 \times 39/27`

`= 9/13 \times 13/9`

`= 1`