mot lop hoc co ba laoij :gioi kha trung binh .so hoc sinh gioi chiem 30 % so hoc sinh ca lop .so hoc sinh kha bang 5/7 so hoc sinh con lai ( hs kha hs tb ).tinh so hs moi loai

lop 6a co 3 loai hoc sinh gioi, kha,tb. hs gioi chiem 4/5 so hs kha va tb. so hs kha =1/3 hs ca lop.biet so hs tb la 5 em. tinh so hs ca lop, hs gioi, kha

mot lop co 40 hs gom 3 loai gioi kha trung binh trong do 30% tong so la hs gioi shs gioi =4/7 hs kha con lai la hs tb tinh moi loai tinh ti so phan tram so hoc sinh tb so voi so hs ca lop

Lop 6B co 45 HS hoc luc duoc chia lam 3 loai: Gioi, kha, trun binh. So HS trung binh chiem \(\frac{2}{9}\)so HS ca lop, so HS kha bang 60% so HS con lai

a) Tinh so HS moi loai

b) Tinh ti so giua cac HS gioi va HS trung binh

c) So HS gioi chiem bao nhieu phan tram hoc sinh cua ca lop?

lop 6a co 45hs ,ket thuc ki 1 gom 3loai hs gioi kha tb . biet rang ti so giua hs gioi va kha la 3/5 . sang hoc ki 2 co 1hs duoc len loai gioi nen ti so giua hs gioi va kha la 2/3. tinh so hs moi loai hoc ki 1

lop 5b cuoi hocj ky 2 co 3 loai hs gioi, kha, trung binh. so hs gioi bang 3/5 so hs  ca lop. so hs kha it hon 3/5 so loai trung binh la 2 em. tinh so hs gioi , kha cua lop biet so hs trung binh la 15em

coui hoc ki 1 hs lop 5a deu dat luc hoc kha hoac gioi trong do so hs gioi chiem 60 % so hs kha nhung chi tieu phan dau cua lop la cuoi nam so hs gioi dat 60 % do do so voi cuoi ki lop 5a phai co them 9 hs nua dat hoc luc gioi hoi lop 5a co bao nhieu hs biet rang trong ca nam hoc lop 5a khong co thay doi ve si so

trong mot dot kiem tra lop 4a cua truong tieu hoc yen son co 1/5 so hs dat hs gioi ,3/7 so hs dat hs kha , con lai hs trung binh ,biet rang hs kha nhieu hon hstrung binh .

1.TINH HS LOP 4A

2. tinh hs moi loai

mot lop hoc co 1 so hs trong do co 60% so hs gioi  50% xep kha biêt tong so hsg va hsk  la 36 ban . tinh so hs ca lop