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.

If a

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

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 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

Let x be an irrational number.If a,b,c and d are rational numbers such that (ax+b)/(cx+d) is a rational number,which of the following must be true?

If a,b,c,d are positive real number with a+b+c+d=2, then M=(a+b)(c+d) satisfies the inequality