Among the four sets of natural numbers, integers, rational numbers and real numbers, which one includes the others? A: The set of natural numbers B: The set of integers C: The set of rational numbers D: The set of real numbers

The purpose of extending the set of natural numbers to the set of integers is to make it closed under ______ operation

All odd numbers are integers (整数). All even numbers are integers. Therefore, all odd numbers are even numbers.

Floating point representation is used to store A: Boolean values B: whole numbers C: real numbers D: integers

If r and s are integers and rs+r is odd, which of the following must be even ？（） A: r B: s C: r+s D: rs-r E: r2+s

If r and s are integers and rs+r is odd, which of the following must be even A: r B: s C: r+s D: rs-r E: (E) r2+s

‌Which of the following is equivalent?‎ A: The division relation on the set of integers B: On the set of rational numbers, the relation of multiplication equal to 1 C: rank relationship D: Logical equivalence of propositional formula

Which of the following is equivalent? A: The division relation on the set of integers B: On the set of rational numbers, the relation of multiplication equal to 1 C: rank relationship D: Logical equivalence of propositional formula

How many positive integers less than 20 are equal to the sum of a positive multiple of 3and a positive multiple of 4（） A: Two B: Five C: Seven D: Ten E: Nineteen

What is the least possible product of 4 different integers, each of which has a value between -5 and 10, inclusive ？（） A: -5040 B: -3600 C: -720 D: -600 E: -120