1) Dan so cac nuoc dang phat trien nhu Viet Nam, An Do, Indonexia,...thuco dang thap:

A. dan so tre    B. dan so on dinh       C. dan so khong on dinh        D. dan so gia

1) Thap tuoi sinh vat, trong do so luong ca the nhom tuoi truoc sinh san cao hon dang sinh san va tuoi dang sinh san cao hon nhom tuoi sau sinh san. Thap tuoi do bieu thi cho quan the:

A. tre, dang phat trien          B. on dinh              C. khong on dinh      D. gia, suy thoai

1) Ve tam giac ABC co 3 goc nhon. Neu cach xac dinh tam duong tron ngoai tiep tam giac ABC

1) Dot chay hoan toan 7,54g hon hop CH₄, C₂H₆, C₃H₆, C₃H₈ va C₄H₁₀ duoc hon hop X. Dan X qua dung dich NaOH dam dac, du nhan thay binh tang them 34,58g. Neu dot chay hoan toan 50,00g hon hop tren thi thai ra moi turong bao nhieu gam khi CO₂

1) Khi xet ve so luong quan the nao sau day co kich thuoc lon nhat

A. Ga rung           B. trau rung         C. ngua rung             D. Voi rung

1) Bieu hien " bung no dan so" o 1 so quoc gia bieu hien ro nhat o thap tuoi co:

A. day rong nhat            B. day hep nhat             C. dinh nho nhat        D. dinh to nhat

1) He is a geat sport enthusiast. He rarely misses any sport games although he was busy ( tu dong nghia) 

A. fan         B. player       C. energy      D. programmer

1) Cho (α): 2x+y-z+3 = 0 va A(1;1;1), B(2;0;-1). Tim M thuoc (α) sao cho MA + MB nho nhat

1) Viet phuong trinh mat cau di qua 3 diem A(2;1;1) B(1;0;0), C(-2;-3;4) va co tam thuoc mat phang (Oyz)

1) Cho M(2;-3;4); N(3;-1;2) ; P(1;1;1). Tim tam duong tron ngoai tiep tam giac MNP