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hello sir, sir a fraction can't be in negative form

as (-5/10) and secondly there are some questions in which we did this procedure
 
 
(2 * 5 / 2) - (3 * 1 / 4)
( 9 / 2    )  - (5 / 4     )( 9  -  5  /  4   )
(4  / 4  )  = 1
is this correct  in some questions we also use this method?
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1 Answer

Yes, a fraction can be negative!  -1/2   -3/4
But depending on how you write the equations the '-' sign might be for negative or subtraction.
12*(-3/4) or  12(-3/4)  is twelve times negative three-quarters
12-3/4  is twelve minus three-quarters
 
 
Also in your question here it is not clear what your question is.
In the last line (4/4) is indeed equal to 1.
But in the first two lines what are you asking?
Is it what those two lines are equal to?  If so...
 
2*(5/2) - 3*(1/4) = (10/2) - (3/4) = (20/4) - (3/4) = 17/4 = 4 1/4
 
(9/2) - (5/4)(9- 5/4) = (9/2) - (5/4)(36/4 - 5/4)
 = (9/2) - (5/4)(31/4) = (18/4) - (155/4) =  -137/4 = -34 1/4