練習冊系列答案
相關(guān)習題
科目:高中數(shù)學
來源:不詳
題型:單選題
已知角

的終邊上一點的坐標為

則角

的最小正

值為 ( )
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
已知

,則

=______________
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:解答題
(本小題滿分12分) 己知函數(shù)

,

(其中

,

,

)的圖象與

軸的交點中,相鄰兩個交點之間的距離為

,且圖象上一個最低點為

(I) 求

的解析式。
(Ⅱ) 求函教

單調(diào)遞減區(qū)間.
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
若函數(shù)

,當

時
f(
x)=0恒有解,則實數(shù)
a的取值范圍是___________
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:解答題
(本小題滿分12分)
某矩形花園

,

,

,

是

的中點,在該花園中有一花圃其形狀是以

為直角頂點的內(nèi)接Rt△

,其中E、F分別落在線段

和線段

上如圖.分別記

為

(

),

的周長為

,

的面積為

。
(1)試求

的取值范圍;
(2)

為何值時

的值為最��;并求

的最小值

查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
設(shè)

表示

與

中的較大者.若函數(shù)

,給出下列五個結(jié)論:
①當且僅當

時,

取得最小值;②

是周期函數(shù);③

的值域是

;④當且僅當

時,

;⑤

以直線

為對稱軸.其中正確結(jié)論的序號為
.
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:單選題
在△ABC中,角A、B、C所對的邊分別為a、b、c,且

,A=45°,

則sinB=
A.

B.

C.

D.1
查看答案和解析>>
科目:高中數(shù)學
來源:不詳
題型:填空題
若

,則

=______.
查看答案和解析>>