Question

using closure property and by suitable arrangement find the sum 4/7+(-4/9) +3/7+(-13/9)​

Answer 1

According to closure property first let us bring 7 terms one side and 9 terms another side

4/7+3/7+(-4/9)+(-13/9)

7/7+-9/9

7/7 can be written as 1

and

-9/9 can be written as -1

So we can write it as 1+(-1)

+×-=-

So, 1-1=0.

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