第 28 章 锐角二角函数自主学习达标检测卷
(时间 90 分钟满分 100 分)
班级— 一 学号__________姓名—一 得分_________
、填空题(共 14 小题,每题 2 分,共 28 分)
sin30 =
心 ABC 中,若 J
2
+ ( —
3
— cosB) =0,则/ C=
2
第二十六章二次函数单元练习......................................................................1
第 28 章 锐角二角函数自主学习达标检测卷..........................................................7
2...................................................................................7
2...................................................................................7
1...................................................................................8
3...................................................................................8
1 1.................................................................................9
2...................................................................................9
B.-.................................................................................9
(2)sin
2
63 -4cos 60 sin 63 1 cos27
3tan 30
...........................................10
si n30°-cos45".....................................................................10
人教版九年级下册期末测试题 (一)...........................................................14
c......................................................................................16
26 章参考答案..........................................................................28
、1—8 题:ECCADEED..................................................................28
y = (x-ir-4 ;.......................................................................28
y = x +1.............................................................................28
y = —X +3............................................................................28
-3m 1,...............................................................................28
-2mx m
2
m
2
_ 3m 1 = (x _ m)
2
m........................................................28
2
x = m..............................................................................28
m —3m +
1
), 即 j
2
....................................................................28
』=m —3m + 1.........................................................................28
代入消元得 y = x
2
- 3x 1...............................................................28
1....................................................................................28
2
b — 25a a =——......................................................................28
IbSOOa [
b
= T........................................................................28
27 章参考答案............................................................................29
20 30..............................................................................29
答案:由题意应有 ,从而有 20(30 - 2x) =30(20 - 2y).....................................29
20 + 2y 30 + 2x....................................................................29
x 3................................................................................29
y 2................................................................................29
3.4................................................................................29
AB BO 即 AB - 1.7..................................................................29
CD.................................................................................29
OD.................................................................................29
臂长...............................................................................29
EG.................................................................................29
BD.................................................................................29
AB.................................................................................29
90.................................................................................29
AB.................................................................................29
(1)................................................................................29
由空二兰即
3
.2P 得。卩十,由/ oabm pob=30................................................29
AB OA 2.3 3........................................................................29
4 4 4 4............................................................................29
28 章参考答案............................................................................29
1..................................................................................29
2..................................................................................29
3..................................................................................29
sin A..............................................................................29
3..................................................................................30
29 章答案:..............................................................................30
九年级数学期末题二参考答案...............................................................30
、选择题..............................................................................31
•••/ MO=Z MCO..........................................................................33