\(1\). O lop \(6A\) so hoc sinh gioi ki \(I\) bang \(\dfrac{2}{3}\) so hoc sinh ca lop. Cuoi nam co them \(5\) hoc sinh dat loai gioi nen so hoc sinh gioi bang \(\dfrac{1}{3}\) so hoc sinh ca lop. Tinh so hoc sinh cua lop \(6A\).
\(2\). Cho goc bet \(\widehat{xoy}\). Tren cung \(1\) nua mat phang bo xy, ve hai tia \(Om\) va \(On\) sao cho \(\widehat{xom}=60\), \(\widehat{yon}=150\).
a, Tinh so do cua \(\widehat{mon}\).
b, Tia \(On\) co phai la tia phan giac cua \(\widehat{xOm}\) khong? Vi sao?
\(3\). Cho \(2\) goc ke bu: \(\widehat{xOy}\) va \(\widehat{yOz}\). Goi tia \(Ot\) la tia phan giac cua \(\widehat{yOz}\). Tinh so do cua \(\widehat{xOt}\) biet \(\widehat{yOz}\) \(=52\).
\(4\). Hay chung to cac phan so sau day bang nhau:
\(\dfrac{23}{99}\); \(\dfrac{2323}{9999}\); \(\dfrac{232323}{999999}\)
Cac ban oi giup minh nha. Ai lam dung va hay minh tick cho!
Help me! Thank you in advance.
Bạn nên gõ bài cẩn thận hơn, chú ý lần sau gõ có dấu nhé!
