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若梯形的上底为3cm,下底为5cm,则此梯形的中位线长为 cm.
若梯形的上底为3cm,下底为5cm,则此梯形的中位线长为 cm.
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若
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有意义,则x的取值范围是
.
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如图,小正方形的边长为2,连接小正方形的三个顶点,可得到△ABC,则AC边上的高是( )
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A.
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B.
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C.
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D.
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A.25°
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B.(-2,3)
C.(2,3)
D.(-2,-3)
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