If `a/b and c/d` are two rational numbers then subtracting `c/d and a/b` means adding additive inverse (negative) of `c/d and a/b`.

If (a)/(b) and (c)/(d) are two rational numbers then subtracting (c)/(d) form (a)/(b) means adding additive inverse (negative) of (c)/(d)rarr(a)/(b)

Properties I If (a)/(b) and (c)/(d) are two rational numbers such that (c)/(d)!=0 then (a)/(b)-:(c)/(d) is always a rational number.

CLoSURE PROPERTY If (a)/(b) and (c)/(d) are any two rational numbers then (a)/(b)-(c)/(d) is a rational number.

If a/b and c/d be two rational numbers and if a = nc, b = nd,when n is a natural number , then what type of rational numbers are the numbers a/b and c/d and why ?

If the product of two non-zero rational numbers is 1 , then they are (a) Additive inverse of each other (b) Multiplicative inverse of each other (c) Reciprocal of each other (d) Both (b) and (c)

If a+sqrt(b)=c+sqrt(d) where a and c are rational numbers sqrt(b) and sqrt(d) are irrational numbers then prove that a=c and b=d .

If the product of two non-zero rational numbers is 1, then they are (a)Additive inverse of each other (b)Multiplicative inverse of each other (c)Reciprocal of each other (d) Both (b) and (c)

If a,b,c,d are positive real numbers such that a+b+c +d = 12 , then M = ( a+ b ) ( c + d ) satisfies the relation :

If A&B are two ratinal numbers and AB,A+B and A-B are rational numbers, then A/B is: a.always rational b.never rational c.rational when B!=0 d.rational when A!=0