15
(3)P(xx)
22
111155
ɡPCA͡PDBȣá(x4)|1|(2x)x.
222222155
x 224
55
P()
24
3 κͼ
2
16(2016ͤһģ)ͬһƽֱϵУyaxbxybxaͼ( C )
A B C D
2
17(2015̨)ͼ֪Ϊ(36)yaxbxc(14)нд( C )
Ab4ac
2
Baxbxcݣ6
C(2m)(5n)ϣmn
2
DxһԪηaxbxc4Ϊ5ͣ1
2
18(2014)֪κyx4x3.
(1)䷽亯ĶC꣬úĺֵԱ (2)ͼxĽAB꼰ABC
222
⣺(1)yx4x3x4x41(x2)1. 亯ĶCΪ(21)
߿ϣ൱x2ʱyxС x>2ʱyx
2
(2)y0x4x30x11x23. ൱AڵBʱA(10)B(30) AڵBҲʱA(30)B(10) AB|13|2.
CCDxڵD 1
SABCABCD
21
21
2
1.
2
19(2016ɽƽһģı)ƽֱϵxOyУymx2mx2(m0)yύڵA
2
xύڵB. (1)ABꣻ
(2)xֻΨһĹ㣬ȷmȡֵȡֵΧ ⣺(1)x0ʱy2.A(02) 2m
߶ԳΪֱx1B(10)
2m
(2)xֻһ㣬 222
b4ac(2m)4m(2)4m8m0.m10m22. ֡m0m2.
12
20(2016ģ)ͼκyxbxcͼA(40)B(44)yύڵC.
4(1)˶κĽʽ
(2)֤BAOCAO(Oԭ)
(3)P߶ABϵһ(ABغ)Pyƽߣֱ˶κͼxQH㣬ʣǷĵPʹPH2QHڣPꣻڣ˵ɣ
⣺(1)ߵA(40)B(44)ڶκͼϣ
??044bc? ?444bc.?
1??b?2
??c2.
121
κʽΪyxx2.
42
(2)֤BBDxڵD(1)C(02) CO21
RtAOCУtanCAO
AO42BD41
RtABDУtanBAD.
AD82tanCAOtanBADCAOBAO.
1
(3)ɵA(40)B(44)ɵֱABĽʽΪyx2.
21121
P(xx2)(4x4)Q(xxx2)
24211121
PH|x2|2xQH|xx2|.
22421121
2x2|xx2|.
242112
2xxx4ʱ
22
5
x11x24(ȥ)P(1)
2112
2xxx4ʱ
22
7
x13x24(ȥ)P(3)
2
57
ĵP(1)(3)
22