函数y=
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+
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中自变量x的取值范围是
.
考点分析:
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如图,已知A、B两点的坐标分别为(-2,0)、(0,1),⊙C 的圆心坐标为(0,-1),半径为1.若D是⊙C上的一个动点,射线AD与y轴交于点E,则△ABE面积的最大值是( )
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A.3
B.
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C.
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D.4
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已知:如图,无盖无底的正方体纸盒ABCD-EFGH,P,Q分别为棱FB,GC上的点,且FP=2PB,GQ=
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QC,若将这个正方体纸盒沿折线AP-PQ-QH裁剪并展开,得到的平面图形是( )
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A.一个六边形
B.一个平行四边形
C.两个直角三角形
D.一个直角三角形和一个直角梯形
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如图,AB是⊙O的直径,弦BC=2cm,F是弦BC的中点,∠ABC=60°.若动点E以2cm/s的速度从A点出发沿着A→B→A方向运动,设运动时间为t(s)(0≤t<3),连接EF,当△BEF是直角三角形时,t(s)的值为( )
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A.
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B.1
C.
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或1
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或1或
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在直角梯形ABCD中,AD∥BC,∠ABC=90°,AB=BC,E为AB边上一点,∠BCE=15°,且AE=AD.连接DE交对角线AC于H,连接BH.下列结论:
①△ACD≌△ACE;②△CDE为等边三角形;③
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=2;④
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.
其中结论正确的是( )
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A.只有①②
B.只有①②④
C.只有③④
D.①②③④
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