MR-693 / 1. problem

Which of the following sentences are statements?

a) 1+1 = 2
b) the number 16 is an odd number
c) an even number can be written in the form 2n, where n is a natural number
d) the solution of the equation 3x=18 is a natural number
e) ( a-b)≥ 0 for every rational a and b
f) ab > 0 if a and b are of the same sign
g) a2 > 0 if a is a negative number
h) - a2 < 0 if a is a negative number

a) 1+1=2

a) YES - TRUE

b) 16 is an odd number.

b) YES - TRUTH (16:2=8)

c) Even numbers can be written in the form of 2n, where n is a natural number

c) YES - TRUE

d) The solution of the equation 3x=18 is a natural number

d) YES - TRUE (3x6=18)

e) (a-b)≥ 0 for every rational a and b

e) YES - TRUE (The square of each number is positive)

f) ab > 0 if a and b are of the same sign

f) YES - TRUE (+·+=+ and -·-=+)

g) a2 > 0 if a is a negative number

g) YES - TRUE (The square of every number is positive)

h) - a2 < 0 ha a negatív szám

h) YES - TRUE (The square of every number is positive, and then it becomes negative by changing the sign of the number)