Signed directional number. Such as +7.
-5, etc
Both are directed numbers. B) zero is not a positive number.
It's not negative.
Therefore, it is not a directed number. C) When writing positive numbers, you can omit the [+] sign. For example, +9 can be written as 9. however
You can't omit the [-] sign when writing negative numbers. D) Every directed number has its relative number.
That is, numbers with the same value but opposite sign. E) Integer includes (i) natural number 1.
2
three
four
…...+ 1
+2
+3
+4
+5 equals a positive number-1.
-2
-3
-4
-5 equals a negative number (negative number), a number with a plus sign [+] and a minus sign [-].
The characteristic of directed number is: 1. Positive numbers are preceded by a (+) sign.
For example+1
+5
+9
However, the plus sign (+) can be omitted.
That is, 1
five
9.2. Negative numbers are preceded by a (-) symbol.
For example-1
-4
-8
However, the (-) symbol cannot be omitted. 3.0 is not a positive number.
It's not negative.
Therefore, it is not a directed number. 4. Every directed number has a number with the same value but opposite sign.
For example,+1 pair-1 and +5 pair -5. 5. The calculation characteristics of directed numbers are (a) positive and positive; Negative and positive; (c) negative and positive and negative; (d) Negation and negation are just like (a)+2x (+3) =+6 (b)+
1)-(-9)-(-3)- Multiply -9=+9
Two negatives make a positive.
So multiply by 3=+3.
So +9+3= 12! ! ! 2) (+7)+(-6)+(-10) = 7-6-10 =-9 Negative is positive, positive is positive, negative is negative, and positive is negative! !
Reference: I
1.9+3 =122.7-6-10 =-9 Open brackets: negative is positive, positive is positive, negative is negative, and positive is negative.
Reference: I