1,tim 1 ps bang ps 2/5 biet neu lay tu so cua ps do cong voi 45 va giu nguyen mau so thi duoc 1 ps moi bang ps 13/20

2,tinh dien tich toan phan cua hinh hop chu nhat co chieu dai 15cm,chieu rong 12cm,chieu cao 9,5cm.

3,bay gio la 2 gio.hoi sau it nhat bao nhieu lau nua thi kim gio va kim phut cua dong ho trung nhau.

4,vao nam tuoi chau bang 1/6 tuoi chau hien nay thi ong cua chau 60 tuoi,biet tong so tuoi cua 2 ong chau hien nay la 82 tuoi,tuoi chau hn la...

5,tim 1 stn biet neu xoa chu so hang don vi cua no di thi ta duoc so moi kem so phai tim la 1808 don vi.

cho 2 phan so 6/7 va 2/9 hay tim p/s a/b sao cho khi them ab/ vao 2 p/s da cho thi ty so cua 2 p/s la 3

cho 2 phan so 6/7 va 1/9 hay tim p/s a/b sao cho khi them a/b vao 1/9 va bot a/b o 6/7 thi ta duoc 2 p/s co ty so la 3

viet duoc bao nhieu p/s  ma tong cua tu so va mau so 2012 co bao nhieu p/s nho hon 1 bang 1 lon hon 1

tim hai so chan co tong la 2100 biet giua chung co 18 so chan khac tim 2 so tu nhien biet tong cua hai so nay la 2019 giua chung co tat ca 20 so tu nhien khac

ai nhanh minh tick 5 lan  giai han bai giai ra nha