If a and b are two rational numbers prove that a+b ,a-b , ab are rational numbers. If b is not equal to 0 show that a/b is also a rational number

If a and b are two rational numbers prove that a+b ,a-b , ab are rati

1.	If a and b are two rational numbers prove that a+b ,a-b , ab are rational numbers. If b is not equal to 0 show that a/b is also a rational number
Answer» If a and b are two rational numbers prove that a+b ,a-b , ab are rational numbers. If b is not equal to 0 show that a/b is also a rational number