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

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

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