不等式组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190945861546495/SYS201311011909458615464007_ST/0.png)
的解集在数轴上表示为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190945861546495/SYS201311011909458615464007_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190945861546495/SYS201311011909458615464007_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190945861546495/SYS201311011909458615464007_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190945861546495/SYS201311011909458615464007_ST/images4.png)
考点分析:
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如图,在△ABC中,D是BC延长线上的一点,∠B=50°,∠ACD=110°,则∠A等于( )
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A.60°
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由四舍五入法得到的近似数0.409,下列说法中正确的是( )
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B.精确到百分位,有3个有效数字
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下列计算正确的是( )
A.a+2a=3a
B.(2a)
2=2a
2C.2+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190945861546495/SYS201311011909458615464004_ST/0.png)
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D.a
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估算
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的值( )
A.在2和3之间
B.在3和4之间
C.在4和5之间
D.在5和6之间
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如图,AE、CD相交于点D,∠1=70°,如果AB∥DC,那么∠A的度数为( )
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