1) Tim gia tri thuc cua m de he phuong trinh\(\left\{{}\begin{matrix}2x+3y+4=0\\3x+y-1=0\\2mx+5y-m=0\end{matrix}\right.\) co duy nhat 1 nghiem

1) Xac dinh hoa tri cua cac nguyen to va phan tu nao lien ket cong hoa tri co cuc va khong cuc: CH4, NH3, N2, CO2, HCL, H2S, C2H6, C2 H4, C2H2, C2H6O

1) Lay vi du ve thuc tien la co so cua nhan thuc

1) Lay vi du ve thuc tien la dong luc cua nhan thuc

1) Van hoa Trung Quoc thoi phong kien anh huong den van hoa nuoc ta nhu the nao

1) Trinh bay su xuat hien va tac dung cua cong cu kim loai

1) Trinh bay su anh huong cua van hoa truyen thong An Do den khu vuc Dong Nam A

1) To chuc xa hoi cua nguoi tinh khon la

A. gia dinh phu he B. bo lac C.bay nguoi nguyen thuy D. thi toc

1) Nguoi toi co da co phat minh lon nao

A. Biet giu lua trong tu nhien B. Biet tao ra lua C. Biet che tao nhac cu D. Biet che tao trang suc

1) Ham so y = x² - 2x + 4 co do thi (P). Trong cac khang dinh sau khang dinh nao sai

A) Miny= 4 ∀ x ∈ [0;3] B) Maxy= 7 ∀x∈ [0;3]