Chứng minh rằng: (10a + 5)2 = 100a . a(a + 1) + 25 Từ đó em hãy nêu cách tính nhẩm bình phương của một số tự nhiên có tận cùng bằng chữ số 5. Áp dụng để tính: 252; 352; 652; 752

nhanhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

Giúp mik vs: 2(x^2+8x+16)-x^2+4=0

Calli: Tokyo revengers Vẽ màu đỏ đen nha, cho bóng nữa nhé Nhân tiện cho hỏi ai thích tokyo revengers k, nếu thích thì đặt ảnh nhóm k nè :)) ?

To many people _______________ (29. MOUNTAIN) seems a very uncomfortable and __________ (30. RISK) sport, full of hardships and dangers. To _______________ (31. ENTHUSE), however, the dangers are accepted in return for the thrill of conquering high peaks. Of course, from time to time, we read of _______________ (32. TRAGEDY) accidents especially when climbers are operating at the limits of human _______________ (33. ENDURE). But if you have the right equipment, a head for _______________ (34. HIGH), good training and you climb within your capabilities, there is no reason why this sport should not be as safe as many other _______________ (35. ACT). Climbers themselves would argue that nothing else brings the same degree of truly _______________ (36. BELIEVE) exhilaration and excitement.

hoàn thành các câu với giới từ đúng giúp mình nhanh với

II. Verb form: 1. I was very tired. I tried ______my eyes open but I couldn’t. (keep) 2. She told him ________the door. (lock) 3. My father allowed me ________his camera. (use) 4. I want ______the truth. (know) 5. When I am tired, I enjoy ______television. It’s relaxing, (watch) 6. It was a nice day, so we decided ______for a picnic. (go) 7. I am not in a hurry. I don’t mind ________. (wait) 8. We were hungry, so I suggested ________dinner early. (have) 9. I really regret _______too much time playing games. (waste) giúp mik với

hoà tan 40gam cuso4 vào nước được 200ml dung dịch. nồng độ mol của dung dịch là bao nhiêu? a. 0,125M b. 0,25M c. 1,2M d. 1,25M

máy anh chị ngủ hết rr ko ai giups em

sorry i can't come. i ...(be) very busy tomorrow