How many times has the number [9] appeared from 1 to 100? The answer is a number

How many times has the number [9] appeared from 1 to 100? The answer is a number

From nine to 89, there's one in ten, so there's nine
Then 90 to 99, there are 11
20 times in all

How many times does the number "9" appear among the numbers 1-100?

Bit 9 to 99, 10 times
Ten, 90 to 99, 10 times
So 20 times

When Xiao Ming writes from 1 to 100, how many numbers does he write with the number "9"?

19

What are the negative integers with absolute value greater than 1 and less than 4? What are the non negative integers with absolute value not less than 2 and not more than 5?

What are the negative integers with absolute values greater than 1 and less than 4?
-2,-3;
What are the nonnegative integers with absolute value not less than 2 and not more than 5?
-2,-3,-4,-5
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What are the nonnegative integers with absolute value not less than 2 and not more than 5?

Non negative integers with absolute value not less than 2 and not more than 5 are (2,3,4,5)

Negative integers with absolute values greater than 1.2 and less than 3.7 have（
I don't understand

-1,0,2,3

How many integers have absolute values greater than two and less than seven?

3,4,5,6,-3,-4,-5,-6

The sum of all integers whose absolute value is less than 7 but greater than 3

0

The number of integers with absolute value ＞ 2 and ＜ 4.5 is ()
A. 5 B. 4 C. 3 d. 2

Let this number be x, then 2 | x | 4.5. ∵ x is an integer, and ∵ x is - 3,3, - 4,4

All integers with absolute value not less than 2 and not more than 5.8 are

2