Tính bằng cách hợp lý

a. 0,2468 + 0,08 x 0,4 x 12,5 x 2,5 + 0,7532

b. 2 giờ 45 phút + 2,75 giờ x 8 + 165 phút

Cửa hàng ban đầu bán một đôi giày giá 400000 đồng. Lần thứ nhất cửa hàng hạ giá 12% giá ban đầu. Cuối năm, cửa hàng tiếp tục hạ tiếp 10% giá trước đó. Hỏi sau hai lần hạ giá, đôi giày đó giá bao nhiêu tiền?

My weekend is very simple, in the morning, I spend about 1-2 hours studying, playing with my brother in the afternoon, spending time with friends by going out with them, or going to work. garden, help parents. I really enjoy weekend activities because they make me feel good and help me relax. For me, a weekend is very long because they are long enough for me to regain my spirit after a week of studying and working hard. Of course, a weekend will certainly be welcomed by many like me, but I don't see that happening in the near future. So basically, whether or not our weekend is long enough depends on how we plan to spend our time.