S 2

UBND TNH BC NINHS GIO DC V O TO THI TUYN SINH VO LP 10 THPT NM HC 2014 2015Mn thi: Ton Thi gian lm bi: 120 pht (Khng k thi gian giao )

Ngy thi: 12 thng 7 nm 2014

Cu 1. (3,0 im)

1. Tm iu kin ca x biu thc c ngha.

2. Gii phng trnh : 3. Gii h phng trnh :

Cu 2. (2,0 im)Cho biu thc vi

1. Rt gn M

2. Tnh gi tr ca biu thc M khi

3. Tm s t nhin a 18M l s chnh phng.

Cu 3. (1,0 im) Hai t khi hnh cng mt lc i t A n B. Mi gi t th nht chy nhanh hn t th hai 10km/h nn n B sm hn t th hai 1 gi. Tnh vn tc mi t, bit A v B cch nhau 300km.Cu 4. (2,5 im) Cho na ng trn (O) ng knh AB = 2R. K hai tip tuyn Ax, By ca na ng trn (O). Tip tuyn th ba tip xc vi na ng trn (O) ti M ct Ax, By ln lt ti D v E.

1. Chng minh rng tam gic DOE l tam gic vung.

2. Chng minh rng : .

3. Xc nh v tr ca im M trn na ng trn (O) din tch tam gic DOE t gi tr nh nht.Cu 5. (1,5 im) 1. Gii phng trnh .2. Cho tam gic ABC u, im M nm trong tam gic ABC sao cho . Tnh s o .------------Ht------------( ny gm c 01 trang)

H v tn th sinh: ...S bo danh: ..... CHNH THC

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