phong GD DT quang trach de khao sat chat luong hoc ki 2 phong GD DT quang trach de khao sat chat luong hoc ki 2 nam hoc 2012 2013 mon toan 8 thoi gian 90 phut (khong ke thoi gian giao de) ma de 02 cau[.]
Trang 1phong GD-DT quang trach de khao sat chat
luong hoc ki 2
nam hoc 2012-2013 mon:toan 8 thoi gian: 90 phut (khong ke thoi gian giao de)
ma de 02 cau 1 (2.0 diem):giai cac phuong trinh sau:
a) 3x-1=0
b) 1/x+2 - 2/x-1 = 4x-8/(x+2)(x-1)
cau 2 (1.0 diem) giai cac bat phuong trinh sau va bieu dien tap nghiem tren truc so
2x-3 >= 5
cau 3.(2.0 diem): luc 7 gio , mot xe may A de den B sau do 1gio,mot oto khoi hanh tu Ade den A van toc trung binh lon hon van toc trung binh cua xe may la 20 km/h ca hai xe den B luc 10 gio 30 phut cung ngay tinh do dai quang duong AB va van toc trung binh cua xe may
cau 4 (3.0 diem) cho tam giac DEF vuong tai d, co DE=3 cm, DF=4cm,
duong cao DP, phan giac goc DEF cat DP tai M va cat DF tai M va cat DF tai N
a)C/M : tam giac PED dong dang voi tam giac DEF
b) tinh do dai cac doan thang EF,PD
c) C/M :
cau 5.(1.0 diem)tinh dien tich xung quanh cua hinh lang tru dung
MNP.M'N'P' co day la tam giac deu canh 4 cm , canh ben MM' = 5cm
cau 6.(1.0 diem) tim x thao man bat dang thuc
2x-1/2-x>1