2/5+3/7-2/9-2/11+2/13 //////////////////////////// + 15151515/45454545 3/5+3/7-3/9-3/11+3/13

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1. `\frac{2/5 + 2/7 – 2/9 – 2/11 + 2/13}{3/5 + 3/7 – 3/9 – 3/11 + 3/13} + {15151515}/{45454545}`

   `= \frac{2.(1/5 + 1/7 – 1/9 + 1/13)}{3.(1/5 + 1/7 – 1/9 + 1/13)} + 1/3`

   `= \frac{2}{3} + 1/3`

   `= 1`

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2.     `(2/5+2/7-2/9-2/11+2/13)/(3/5+3/7-3/9-3/11+3/13) + (15151515/45454545)`

   `= (2(1/5+1/7-1/9-1/11+1/13))/(3(1/5+1/7-1/9-1/11+1/13)) +( 1/3)`

   `= 2/3+1/3`

   `= 1`

    

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