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有下列说法:①等弧的长度相等;②直径是圆中最长的弦;③相等的圆心角对的弧相等;④圆中90°角所对的弦是直径;⑤同圆中等弦所对的圆周角相等.其中正确的有( )
A.1个
B.2个
C.3个
D.4个
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如图,把一个长方形的纸片对折两次,然后剪下一个角,把剪下的这个角展开,若得到一个锐角为60°的菱形,则剪口与折痕所成的角α的度数应为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068006_ST/images0.png)
A.15°或30°
B.30°或45°
C.45°或60°
D.30°或60°
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如图,在Rt△ABC中,∠ABC=90°,AB=8cm,BC=6cm,分别以A,C为圆心,以
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068005_ST/0.png)
的长为半径作圆,将Rt△ABC截去两个扇形,则剩余(阴影)部分的面积为( )cm
2.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068005_ST/images1.png)
A.24-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068005_ST/1.png)
π
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068005_ST/2.png)
π
C.24-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068005_ST/3.png)
π
D.24-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068005_ST/4.png)
π
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根据下列表格的对应值,判断方程ax
2+bx+c=0(a≠0,a、b、c为常数)一个解的范围是( )
x | 3.23 | 3.24 | 3.25 | 3.26 |
ax2+bx+c | -0.06 | -0.02 | 0.03 | 0.09 |
A.3<x<3.23
B.3.23<x<3.24
C.3.24<x<3.25
D.3.25<x<3.26
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在Rt△ABC中,∠C=90°,cosA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068003_ST/0.png)
,那么tanB=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000805771906820/SYS201311030008057719068003_ST/3.png)
D.
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