From 1 to 100, how many times does the number 9 appear? The alternative answers are a 9, B10, C20. I'm not doing it. Am I confused? Or is the alternative answer wrong?

From 1 to 100, how many times does the number 9 appear? The alternative answers are a 9, B10, C20. I'm not doing it. Am I confused? Or is the alternative answer wrong?

9 19 29 39 49 59 69 79 89 90 91 92 93 94 95 96 97 98 99
20 in all

On September 13, 2010, when Xiao Ming wrote from 1 to 100, how many numbers did he write with the number "1"

1+10+8+1=20
He wrote 20 numbers with the number "1"

About the moon small composition 100 words, to use analogy, column number writing

In the evening, I stand on the windowsill and look up at the moon. The moon is like a banana hanging in the sky, very bright. Sometimes the moon is like a moon cake. I heard that there are dozens of elements on the moon, which can become another home for us in the future!
It's said that the moon also has the legend of beautiful E. for example, the habit of eating moon cakes comes from the beautiful legend
The moon is far away from us, but it's very close to us. Because we can meet each other every day. I really want to have a look at the sky and see what the moon looks like
Instructor: Lu Yuehong

What is the number of integers with absolute values greater than 1 and less than 5

There are six, namely: - 2, 2, - 3, 3, - 4, 4

How many integers with absolute values less than five and greater than two? They are

Four 3 4 - 3 - 4

Negative integers with absolute values greater than π are -------- integers with absolute values greater than 1.5 and less than 3.5 are----------

-3,-2,-1 ＋2,±3

The sum of all integers with absolute values greater than - 3 / 1 / 2 but less than 2 / 1 / 2 is

-2 - 10 1 2, and 0

Integers greater than - 1 but less than 3 have______ ．

Integers greater than - 1 but less than 3 have 0, 1, 2, so the answer is: 0, 1, 2

The product of all negative integers whose absolute value is not less than 2 but less than 5 is______ ．

All negative integers whose absolute value is not less than 2 but less than 5 are - 2, - 3, - 4, and their product is (- 2) × (- 3) × (- 4) = - 24

What is the product of all negative integers whose absolute value is not less than 2 but less than 5?

The integers whose absolute value is not less than two but less than five have - 2, - 3, - 4,2,3,4, and the product of all negative integers is (- 2) × (- 3) × (- 4) = - 24