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.

(d) (0)/(0) is 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,c,d are positive real number such that a+b+c+d=2 , then M=(a+b)(c+d) satisfies the relation:

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 ?

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

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)

Let a,b inQ"such that"(39sqrt2-5)/(3-sqrt2)=a+bsqrt2, then (A) sqrt((b)/(a)) is a rational number (B) b and a are coprime rational numbers (C) b-a is a composite number (D) sqrt(a+b) is a rational number

Let a,b inQ"such that"(39sqrt2-5)/(3-sqrt2)=a+bsqrt2, then (A) sqrt((b)/(a)) is a rational number (B) b and a are coprime rational numbers (C) b-a is a composite number (D) sqrt(a+b) is a rational number