Bài kiểm tra giữa kỳ I_Toán 8_2010-2011

PHÒNG GD&ĐT THÀNH PHỐ SƠN LA
TRƯỜNG THCS CHIỀNG CƠI
Họ và tên: …………………………………………………………………….. Lớp 8 ……………
Họ tên, chữ ký giáo viên coi kiểm tra số 1:
…………………………………………………………………………….
Họ tên, chữ ký giáo viên chấm kiểm tra số 1:
…………………………………………………………………………….
Họ tên, chữ ký giáo viên coi kiểm tra số 2 :
…………………………………………………………………………….
Họ tên, chữ ký giáo viên chấm kiểm tra số 2:
…………………………………………………………………………….
BÀI KIỂM TRA GIỮA KỲ I - NĂM HỌC 2020-1011
Môn: Toán lớp 8
Thời gian: 45 phút (Không kể thời gian giao đề)
Điểm Lời phê của giáo viên
(Học sinh làm bài trực tiếp vào đề kiểm tra này)
ĐỀ BÀI
Câu 1 (2 điểm): Thế nào là phân tích đa thức thành nhân tử? Áp dụng phân tích đa
thức
2 2
M x y xy x y= + − −
thành nhân tử .
Câu 2 (2 điểm): Tìm x biết:
5x.(x 2) 2 x 0− + − =
.
Câu 3 (2,5 điểm): Chứng minh
3 3 2
x y xy.(x y) (x y).(x y)− + − = − +
.
Câu 4 (3,5 điểm): Cho tam giác ABC vuông tại A, đường cao AH. Gọi E, F lần lượt
là hình chiếu vuông góc của H trên AB, AC. Điểm D là trung điểm của đoạn thẳng

BC.
a. Chứng minh: EF AH= .
b. Chứng minh AD vuông góc với EF.
BÀI LÀM PHẦN TỰ LUẬN
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