s=1.3+2.4+3.5+4.6+5.7+6.8+7.9............................+99.101

a) Để viết được các số tự nhiên từ 1 đến 99 cần bao nhiêu chữ số 5 ? b) Để viết được các số tự nhiên từ 100 đến 999 cần bao nhiêu chữ số 9 ? c)Khi viết tất cả các số tự nhiên từ nhiên từ 1 đến 100 thì chữ số 1 được viết bao nhiêu lần ?

Trả lời giúp mk từ câu 77 đến câu 85 nha. Thank

bÀI 1 ThÔI ạ nhanh nha hộ em van mn nhất anh dinhhongquan với cường bso

she plans to carry out an ...... project (environment) car exhaust emissions are ...... our cities It is necessary that students enhance their ...... of protecting the environment (aware) a lot of undersea ... have died because of water pollution (create) ...... waste can cause soil pollution (chemist) what about giving a .... about light pollution (speak) water .... has become an esential issue (qualify)

Giúp mk vs pls. Ai nhanh nhất tick 5 sao và ctlhn

I. Mark the letter A, B, C or D to indicate the correct option to fill each of the following blanks. 1. Our seats were ____far from the stage that we couldn't see the actors and actresses clearly. A. very B. too C. enough D. so 2. He was _____ he never washed his clothes by himself. A. too lazy B. so lazy that C. very lazy that D. such lazy that 3. They are _____ young _____ drive the car. A. so / that B. too / to C. enough / to D. not only / but also 4. It was _____ a boring speech that I felt asleep. A. such B. so C. very D. too 5. Is there _____ for everyone? A. food and drink enough B. enough food and drink C. enough of food and drink D. enough food and drink enough 6. He was _____ he could not continue to work. A. very tired that B. such tired that C. too tired that D. so tired that 7. John’s eyes were _____ bad that he couldn’t read the number plate of the car in front. A. such B. too C. so D. very 8. - Why don’t we make a fire? - It’s not cold _____ to make a fire. A. too B. enough C. such D. much 9. Most of the pupils are _____ to pass the examination. A. enough good B. good enough C. too good D. very good 10. You can send me a letter if you want to, but your phone call is _____ for me. A. enough good B. good as enough C. good enough D. good than enough 11. Davis has _____ many patients _____ he is always busy. A. too / that B. very / until C. such / that D. so / that 12. It was _____ a difficult question that they couldn't explain. A. so B. such C. very D. too 13. The lesson _____ for me to understand. A. is very difficult B. too difficult C. difficult too D. is too difficult 14. The tent show is _____ for us to see. A. enough interesting B. very interesting C. interesting enough D. interesting 15. They are _____ that they can't buy a bicycle. A. enough poor B. poor enough C. so poor D. too poor

Complete the sentences with given words 1. How much/time/day/you/spend/playing game? 2.Marie/like/window shopping/her close friend/Saturday evenings.

Vẽ con vật : mèo gấu , chó ,........ vẽ 1 thôi nhé !! phải cute ttv cho nhóm :vvvv

Cho tam giác ABC có đường cao AH. Từ 1 điểm M bất kỳ trên cạnh BC, kẻ MD vuông góc AB và ME vuông góc AC. Chứng minh năm điểm A D H M cùng nằm trên 1 đường tròn.