If only two numbers are involved,
Let A and B be real, non-zero numbers.
1) (+)A + (+)B = (+) ?
This is always true.
2) (-)A + (-)B = (-) ?
This is always true.
3) (+)A - (-)B = (+) ?
This is always true.
4) (-)A - (+)B = (-) ?
This is always true.
5) (-)A - (-)B = (+) ?
This is not always true. For instance,
-5 - (-3) = -2, but -3 - (-5) = +2.
Hope this helps~ :3
A positive integer minus a positive integer is always positive.
This statement is sometimes true. For example, 17 – 5 = 12, but 15 – 20 = –5.
post five other statements about the addition and subtraction of positive and negative integers, and ask whether each is always true, sometimes true, or never true.
1 answer
1 answer