use "/", not "\".

You posted the same question about "3" and I will give the same answer here: it depends upon specifically which definition of "decimal fraction" you are using. The Wikipedia definition I posted before would say "no, -0,5 is not a decimal fraction" but not because it is negative. That definition would say that "-0,5" is not a fraction because it is not aalso aDecimal Fractions

what about -0,5 is it a normal Fraction ?

i really don't know because it is negative

(-0,5 is a Decimal Fraction)fractionbut that -5/10, which is just a different way of writing -0,5,isa decimal fraction.