a 5^n=125 b 3^4 x 3^n = 3^7 c 27 x 3^n = 24^3 d 49 x 7^n = 2401 e 9 < 3^n < 81 f 25 lớn hơn hoặc bằng 5^n bé hơn hoặc bằng 125 GIÚP MÌNH VỚI

so sánh 3^35 và 5^19 -80^5 và -18^21

lập dàn ý và viết bài văn tả cảnh đồng lúa ở quê hường em không cop mạng văn càng dài càng tốt

2m(5m+2)+(2m-ba) (ba mét -1) Rút gọn theo hằng đẳng thức đáng nhớ{50đ}

Tính tổng s=1+4+9+16....+n^2 cho đến khi s>=300

Cho ∆ABC , trên cạnh BC lấy hai điểm I và J sao cho BI=IJ=JC. Biết góc A = 90° , BC = 6cm cho vectơ u = AB vectơ + AI vectơ + AJ vectơ + AC vectơ. Tính độ dài vectơ u

1)Tìm x, biết : a)2,5:13,5=x:3/5 b) -6/x=4/7/1+1/3 d)-3/x-1=8/15

1. Don't forget _________ (phone) your mother 2. I love _________ (be) on my own and _________ (listen) to music 3. Would you like _________ (go) to the beach this afternoon? 4. I enjoy _________ (read) your letters very much 5. We like _________ (live) here but we miss _________ (talk) to our old friends 6. Mathew suggested _________ (go) out for a meal but I wanted _________ (stay) at home 7. She couldn't _________ (reply) because she didn't know what to say 8. My friend let me _________ (drive) her car 9. She doesn't allow _________ (smoke) in the house 10. I wish that dog would _________ (stop) _________ (bark). It's driving me mad 11. The film was very sad. It made me _________ (cry) 12. Can you remind me _________ (buy) some coffee when we go out? 13. I tried _________ (give) up _________ (take) sugar in my tea but I didn't like it 14. I am hoping _________ (stop) _________ (work) at the factory soon 15. Her mother makes her _________ (clean) her room 16. Don't worry. The exam may not _________ (be) very difficult 17. He started _________ (play) golf last year 18. I'd like _________ (continue) _________ (study), but I haven't got enough money 19. I'm thinking of _________ (buy) a car 20. She finished _________ (write) the book but then she decided _________ (start) another one

Phân tích thành thừa số nguyên tố :((((

111^2 - 137^2 - 48^2 + 96 x 137