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

Trong 1 lop 60% so hs gioi la 9 em

a)tinh so hs gioi cua lop

b)2/3 hs kha = 80% HSgioi. tim so hs kha cua lop

C)biet lop chi co gioi va kha. tim tong so hs cua lop

ai nhanh mk tick cho

lop 5b co so hoc sinh gioi nhieu hon 1/5 so hoc sinh cua lop la 3 em . so hoc con lai la hoc sinh kha va nhieu hon 1/2 so hoc sinh lop la 9em .hoi lop 5b co bao nhieu em

lop 5a co so hoc sinh gioi =0,75 so hs kha sau do co hs gioi lop 5b chuyen sang nen so hs gioi=0,8 so hs kha tinh so hs kha luc dau cua lop 5a

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

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

​1 lop co 25% hs gioi , 55% hs kha con lai la hs trung binh . Tinh so hoc sinh cua lop do bt so hs trung binh la 5 bn

 Lop 6a co 22 hs gioi ,chiem 55% so hs ca lop .so hs kha bang 20% so hs ca lop ,con lai la hs trung binh.

a/ tinh so hs ca lop ,so hs kha, so hstrung binh cua lop 6a.

b/ tinh ti so phan tram cua hs trung binh so voi hs ca lop.

lop 5 a it hon lop 5b 4 em 1/5 hs 5 a nhieu hon 1 /7 so hs 5b hoi moi lop co bao nhieu em ghi ro loi giai