Lop 5A co 32 ban, cac ban thich choi cau long, bong ban. Biet rang co 24 ban thich choi cau long, 16 ban thich choi bong ban. Hoi co bao nhieu ban thich choi ca 2 mon ?

Mot lop hoc co 1/2 so hoc sinh thich ve ,2/3 so hoc sinh thich choi bong da ,1/10 thich boi ,1/15 thich hoc  biet so hoc sinh choi bong da  nhieu hon so hoc sinh thich ve la 15 hoc sinh . Tinh so hoc sinh thich cac mon nay va tong so hoc sinh cua ca lop

Trung binh cu 100 hoc sinh trong truong thi co 12 ban thich choi bong da. Hay tim ti so phan tram cua so ban thich choi bong da va so hoc sinh toan truong.

giup em voi moi nguoi

lop 6a co 45 hoc sinh,trong do 2/3 so hs thich da bong,60% thich da cau,2/9 thich choi bong ban va4/15thich choi bong chuyen.Tinh so hs lop 6a thich da bong,da cau,bong ban,bong chuyen

trung binh cu 100 ban hoc sinh trong truong thi co 12 ban thich choi bong da.Hay tim so phan tram cua so ban thich choi bong da va so hoc sinh toan truong.

trung binh cu 100 ban hoc sinh trong truong thi co 12 ban thich choi bong da  hay tim ti so phan tram cua so ban thich choi bong da va so hoc sinh toan truong .

1:chi ra tinh chat dac trung cua cac phan tu cua no

C={2;6;12;20;...;72}

2:Cho m={10;11;12;13}

a)viet tat ca cac tap hop con cua tap hop m.Viet duoc tat ca bao nhieu phan tu?

b)voi cac tap hop con cua m ma moi phan tu cua no deu la so le

3;ket qua dieu tra lop 6a co 20 em thich choi cau long, 17 em thich choi bong da. Con 10 em thich choi ca 2 mon cau long va bong da. Hoi lop do co bao nhieu hoc sinh?

mot lop hoc co 50 hs,trong do co 30 hs tham gia choi bong chuyen,25 hs tham gia choi bong ban,7 hs khong choi gi ca.Hoi so bao nhieu hoc sinh vua choi bong chuyen,vua choi bong ban?