DA-HKI-2010-Toan-lop9
description
Transcript of DA-HKI-2010-Toan-lop9
S GIO DC V O TO
S GIO DC V O TO
KIM TRA HC K I
THNH PH NNG
NM HC 2010 - 2011
HNG DN CHM MN TON LP 9
Di y l s lc biu im kim tra hc k I, t chuyn mn cc trng THCS tho lun thng nht thm chi tit li gii v biu im. T chuyn mn c th phn chia im nh n 0,25 im cho tng , tng cu ca kim tra. Tuy nhin, im tng bi, tng cu khng c thay i. Ni dung tho lun hng dn chm c ghi vo bin bn ca t chuyn mn.
Hc sinh c li gii khc li gii do t chuyn mn thng nht, nhng lp lun v kt qu chnh xc, bi lm ng n no th cho im .
Vic lm trn s im bi kim tra c thc hin theo quy nh ca B Gio dc v o to ti Quyt nh s 40/2006/BGD-T.
BiNi dungim
1(2,0)a) Tm iu kin ca x biu thc A c xc nh1,00
Xc nh c iu kin v c ngha0,50
Kt lun ng iu kin A c ngha l
0,50
b) Vi iu kin trn, chng minh rng
1,00
Do nn c hai trng hp
Khi x = 16 th A = 00,25
Khi x > 16 th
0,25
(
0,25
Kt lun0,25
2(2,5)a) V hai th (d1) v (d2).1,00
(d1) qua hai im A(0 ; 3) v C(1 ; 5)0,25
(d2) qua hai im B(2 ; 0) v C(1 ; 5)0,25
V ng hai th0,50
b) ng bin trn
0,50
Hm s ng bin khi v ch khi
0,25
Kt lun: Khi th hm s ng bin0,25
c) Tm m (d1), (d2) v (dm) ng qui.1,00
(d1) v (d2) ct nhau ti (1 ; 5)0,25
(d1) , (d2) v (dm) ng quy khi v ch khi
(dm) i qua im (1 ; 5)0,25
Hay
0,25
Hay ( kt lun0,25
3(2,0)a) Gii h phng trnh1,00
H phng trnh tng ng vi h phng trnh (
0,50
( ( kt lun0,50
b) Tm x1,00
Ta c v
0,50
Nn phng trnh cho c th vit li (
0,25
Vy tha iu kin bi0,25
BiNi dungim
4(3,5)
Hnh v cho hai cu a v b 0,50
a) Tnh cc cnh ca tam gic ABC1,00
BC = 2AM =10 (cm)0,25
(
0,25
0,25
Kt lun: BC = 10 cm
0,25
b) Chng minh cc im A, H, M, N, P cng thuc mt ng trn.1,00
MN// (tnh cht ng trung bnh trong (ABC) ( AP//=MN (1)
(2).0,25
T (1) v (2) ( APMN l hnh ch nht
Gi O l trung im AM ( OA = OP = OM = ON (3)0,25
Tam gic AHM vung ti H c O l trung im AM ( OH = OA = OM (4)0,25
(3) & (4) ( kt lun0,25
c) Tnh tch
1,00
Theo chng minh trn suy ra MB l trung trc AB ( BB = AB0,25
Tng t MC l trung trc AC ( CC = AC0,25
M tam gic MBC vung ti M c ng cao MA nn AB(AC = MA20,25
Vy BB(CC = MA2 = 25 (cm2)0,25
MA TRN KIM TRA HC K I NM HC 2010-2011CH NHNBITTHNGHIUVNDNGTNG
I SCHNG I
Cn bc 2Cn bc 3Khi nim cn bc 2 1
11
1
Cc php tnh v cc php bin i n gin v cn bc 21
11
12
2
CHNG II
Hm s bc nhtHm s1
11
1
H s gc ca ng thng, v tr tng i1
0,51
12
2
CHNG IIIH PT bc nhtH phng trnh bc nht 2 n1
11
1
HNHCHNG IH thc lng trong tam gic1
1,251
12
2,25
CHNG IIng trn1
1,251
1,25
TNG CNG3
3,254
3,753
310
10
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