Rút gọn các biểu thức sau: a) A= $\sqrt{45}$ :$\sqrt{5}$ - $\sqrt{72}$ +3$\sqrt{8}$ b) B= $\frac{-3}{\sqrt{2}-1}$ -$\frac{3\sqrt{6}-3\sqrt{10}}{\sqrt{3}-\sqrt{5}}$

Hai tủ sách có tất cả 230 quyển. Nếu chuyển 14 quyển ở tủ thứ nhất sang tủ thứ hai thì số sách hai tủ bằng nhau. Hỏi lúc đầu mỗi tủ có bao nhiêu quyển sách?

Vẽ anime/chibi/mầm Y/c: đẹp :3 có tâm tradi /digi đều nhận

Cho mik hỏi 16 với 17 nha ( k cần vẽ hình)

Cho tam giác ABC có AB=5,BC=7,AC=9.Gọi D là điểm trên đoạn AC với BD=5.Tính tỉ số AD/DC

vẽ anime buồn nL:MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

chứng minh COS 15 độ = $\frac{\sqrt[]{6}+\sqrt[]{12}}{4}$ (theo 3 cách)

II. Transformation (review) 1. Jasmine did the washing up, and afterwards she took out the garbage. - Having ___________________________._________________. 2. Jim said to me, “I didn’t two days ago.” - Jim ______________________________________? 3. He failed to work out the maths questions although they were easy . - It _________________________________ 4. I haven’t eaten out for two months. - The ___________________________________. 5. If you don’t pay him back the money, he will prosecute you. Pay __________________________________________. 6. How much does he weigh? - What _____________? giúp mik với mn

1. If you come with , I(do)............. the shopping with you. 2. Jimmy (help) ............ his mother in the garden if she reads him a story this evening. 3. If it (rain) ........................,I will stay at home. 4. Our teacher will be happy If we (learn)................ the poem by heart. 5. If they had enough money, they (buy) ................... a new car. 6. We (pass) ............................. the exam if we study harder. 7. If Pat (repair)................ his bike , he could go on a bicycle. 8. She would get 100 puonds If she (sell) .......................... this old shelf. 9. If I were you , I (not invite).......................... jack to the party. 10. If the weather (be) ..................... fine, the children can walk to school.

Giúp mình với mình vote cho 5 sao