7/30/2019 day kem quy nhon 1000B tran hung dao

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S GIO DCVOTO H NI KIM TRA HC K I NM HC 2012- 2013

Trng THPT Quc Oai Mn: TON, khi11Thi gianlm bi: 90 pht, khng k thi gian pht

Cu 1 ( 3 im)Giicc ph ng trnh l nggic sau

1. 23 2 tan 4 0

cos x

x

2.2cos sin

1sin 2 1

x x x

Cu 2 ( 2 im) Mtthcsinh tr ctun gm6 nam v 4 n . Ngiphtrch c n chnmtnhm 4

hcsinh dndpphng th nghi m.

1. Hic bao nhiu cch ch nnhm n unhm cchnc t nh tmthcsinh n .2. Tnh xc su t nhm cchngm4 hcsinh nam.Cu 3 ( 1 im)

Tm h scashngcha 6 trong khai tri n nh thc 3

2 3( ) n x x

, bit

1 14 2 2 7( 3)

n n nn n nC C C n

.

Cu 4 ( 4 im) Cho hnh chp S.ABCD c yABCD l hnh thang ( y l n AD).

1. Xc nhgiao tuy n cacc c pmtphng a. mp(SAB) v mp(SCD).

b. mp(SAD) v mp(SBC).

2. GiH, E, F l n ltl trung im cacc onthngCD, SA, SB. Xc nhgiaoim K c aAD v mp(HEF). T dngthitdincahnh chp khi c tbimp(HEF).

3. KDx // AC. Ch ngminh EH // mp(SD, Dx).HT