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- 3一个高=5cm 底面周长15.7cm的圆锥,求表面积.
- 4___A_apple fell from the tree and hit him on ____head.A,An;the B,The;the Can;/ D,The;/
- 5求函数y=2x+1/x与y=-=3x-4的图象的交点坐标.
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