an equilateral triangle of side 12 has its conrner cut off to form a regular hexagon

a) what is the area of the corner cut off?

b) find the are of the 

a)125^5:5^3= 5^15:5^3=5^12
tương tự như cách trên:
b) 3^15
c)5^90

1. You have to throw the ball into the net when you play ………… (basketball/ football/ tennis/ badminton) 2. My sister often ………… badminton in her free time. (play/plays /playing/ to play) 3. " …………do you do judo?" - "Twice a week." (When/Where/How often/Why) 4. …………draw on the walls and tables, please. (Do/Don't/ Should/Shouldn't) 5. Last summer, I …………fishing with my uncle in the afternoon. (go/went/goes/going) 6. I like watching football matches, but I am not very good …………playing football. (at/in/on/for) 7. We ………… to Ho Chi Minh City for our last summer vacation. (go/went/goed/will go) 8. …………Liz buy a lot of souvenirs for her friends? (Did/Do/Were/Is) 9. John …………return to America last week. (doesn't/ isn't/didn't/ wasn't) 10. Last weekend Phong and Lan …………their grandparents. (visit/is visiting/will visit/visited) 11. All of us …………at home yesterday evening. (were/was/did/are) 12. She …………home at 7;15 this morning. (leaves/leave/is leaving/left) 13. How much money did he give you? He …………me 20 dollars. (give/gives/ is giving/gave) 14. She …………to the countryside with us last week. (didn't come/doesn't come/ didn't come/coming) 15. He ………… so much last night. (drink/ drinks/drinking/ drank)

: Chiều dài của một khu vườn hình chữ nhật tăng lên 1/6của nó, còn chiều rộng giảm bớt  1/6 của nó. Hỏi diện tích khu vườn tăng hay giảm bao nhiêu?

tìm a , b thuộc Z để 5/2a=1/6+b/3 là số nguyên

tìm hộ mik nhé