1; tong ket nam hoc lop 5e co 60 phan tram so hoc sinh xep loai hoc luc gioi 30 phan tram so hoc sinh xep loai hoc luc kha  con lai 4 em xep loai hoc sinh trung binh. hoi lop 5e co bao nhieu hoc sinh , trong lop co bao nhieu em xep loai hoc luc gioi?

2;  lop 5b co 1\2 so hoc sinh duoc xep loai hac luc gioi, 1\3 so hoc sinh xep loai hoc luc kha con lai la hoc sinh xep loai hoc sinh trung binh. hoi lop co bao nhieu hoc sinh duoc xep loai hoc luc gioi? biet so hoc sinh xep loai hoc luc gioi nhieu hon so hoc sinh xep loai hoc luc kha la 5 ban?

3; khi chuyen dau phay cua so thap phan D sang trai mot hang thi so do giam di 18,072 don vi so thp phan D la bao nhieu?

4; khi chuyen dau phay cua so thap phan B sang phai mot hang thi so do tang them 175,05 don vi so thap phan B la bao nhieu?

5;khi chuyen dau phay cua so thap phan C sang trai 2 hang thi so do giam di 198,98 so thap phan C la bao nhieu?

6;khi chuyen dau phay cua so thap phan D sang phai 2 hang thi so do tang them ,198,891 don vi so thap phan D la bao nhieu?

7;0,25 phan tram cua mot so bang 3,8 thi so do la bao nhieu?

8; 1,25 cua mot so bang 1 thi so do la bao nhieu ?

giup minh nhe co the cac ban giai ra loi van duoc khong

Bai1:hieu cua 2 phan so bang 2\(\frac{3}{7}\)phan so thu nhat bang \(\frac{1}{4}\)phan so thu hai.Tim phan so thu 2

Bai 2:nam nay tuoi me hon tuoi con la 25 tuoi.Hai nam truoc day,tuoi me bang \(\frac{7}{5}\)hieu so tuoi hai me con.Vay me nam nay bao nhieu tuoi ?

Bai 3:truoc day mua 5 lit dau phai tra 120000 dong .hien nay gia moi lit dau tang len 6000 dong .hoi voi 120000 dong thi hien nay co the mua duoc bao nhieu lit dau nhu the ?

Bai 4:tim so chan nho nhat co bon chu so sao cho khi chia cho 369 thi co so du lon nhat ?

Bai 5:khi danh so trang 1 quyen sach nguoi ta thay trung binh moi trang phai dung hai chu so . Hoi quyen sach  do co bao nhieu trang 

Bai 6:cho day so tu nhien lien tiep 1;2;3;4;5;...x

tim x biet day so tren co 1989 chu so

Bai 7:tim so trung binh cong cua tat ca cac so le co hai chu so chia het cho 5