Đề bài(chắc đúng):Có bao nhiêu số có 2 chữ số?
Số nhỏ nhất có 2 c/s là 10.
Số lớn nhất có 2 c/s là 99.
Số các số có 2 chữ số là:( 99 - 10 ) :1 + 1 = 90 (số)
Đ/S:90 số.
How many single digit numbers are there?
Answer: numbers.
How many 2 - digit even numbers are there ?
Answer: ............. number .
how many two-digit numbers are there in which the tens digit is greater than the ones digit?
how many 2-digit even numbers are there ?
Choose 3 digits, without repetition, from 1, 2, 4, 6, 8 to form 3-digit even numbers. How many numbers are there ?
Please help me !
Choose 3 digits from 8, 6, 0, 5, 2 and 1 to form 3-digit numbers. How many odd numbers
are there? (The repetition of digits is not allowed)giúp me với
The numbers from 1 to 1000 are written. How many of these numbers have at least two digit 5?
choose 3 digits from 1, 3, 4, 5, 9 to form 3-digit numbers. how many number(s) that can be divisible by 5 is / are there?
choose 3 digits from 1, 3, 4, 5, 9 to form 3-digit numbers. how many number(s) that can be divisible by 5 is / are there?
How many natural numbers between 1000 and 4000 are there for which the thousands digit equals the sum of the other three digit?
a.20 b.19 c.16 d.12
