Các số có 3 chữ số là: `100;101;102;...;999`
Khoảng cách giữa mỗi số tự nhiên có 3 chữ số liên tiếp là `1`
Có số tự nhiên có 3 chữ số là:
`(999 - 100) : 1 + 1 = 900` (số)
Đáp số: `900` số
Dãy số tự nhiên có 3 chữ số là : 100 ; 101 ; 102 ; ... ; 998 ; 999
Dãy trên có số số hạng là :
( 999 - 100 ) : 1 + 1 = 900 ( số )
Vậy có 900 số tự nhiên có 3 chữ số
`#dtkc`
1. I'll buy a new hat. I'll give it to you. àIf______________________________. 2. Today isn't Sunday. The pupils can't go swimming. àIf______________________________. 3. He wasn't here. He didn't have a lot of fun. àIf______________________________. 4. My brother will have enough money. He will buy a bicycle. àIf______________________________. 5. He didn't have time. He didn't read this novel. àIf______________________________. 6. Because she missed the bus, she was late. àIf______________________________. 7. Peter doesn't study hard, so he can't get good marks. àIf______________________________. 8. My sister is absent from her class because she has a terrible headache. àIf______________________________. 9. Windy didn't come, so we cancelled the meeting. àIf______________________________. 10. He was angry, so he didn't say anything. àIf______________________________. Em cần gấp
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