Đề kiểm tra chất lượng 15 phút Đại số 8 - Trường THCS Bản Hon

PHÒNG GD&ĐT TAM ĐƯỜNG
TRƯỜNG PTDT BT THCS BẢN HON
Họ và tên:...................................................
Lớp 8 ....
ĐỀ KIỂM TRA CHẤT LƯỢNG HS 
THỜI GIAN: 15 PHÚT
MÔN : TOÁN 8
ĐỀ BÀI
Giải các phương trình 
a) 4x – 20 = 0
c) 5 – (x – 6) = 4(3 – 2x)
b) 3x – 2 = 2x – 3
d) 
BÀI LÀM
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HƯỚNG DẪN CHẤM
Giải các phương trình
Câu
Nội dung
Điểm
a
 4x – 20 = 0
ó 4x = 20
ó x = 5
=> S = {5}
1
1
0.5
b
 3x – 2 = 2x – 3
ó 3x – 2x = – 3 +2
ó x = – 1
=> S = {– 1}
1
1
0.5
c
 5 – (x – 6) = 4(3 – 2x)
ó 5 – (x – 6) – 4(3 – 2x) = 0
ó 5 – x + 6 – 12 + 8x = 0
ó 7x – 1 = 0
ó x = 
=> S = {}
0.5
0.5
0.5
0.5
0.5
d
ó
ó2(5x – 2) = 3(5 – 3x)
ó2(5x – 2) – 3(5 – 3x) = 0
ó10x – 4 – 15 + 9x = 0
ó 19x – 19 = 0
óx = 1
=> S = { 1}
0.75
0.5
0.25
0.25
0.25
0.25
0.25