把一块底面半径5厘米，高10厘米的圆柱形铝块，熔铸成一个底面半径10厘米的圆锥形铝块，圆锥的高是多少厘米？
×÷÷÷×÷÷．
直接写出得数．×=××=÷3= 12×=+﹣+= 20÷= 18÷÷=×= 0×=×÷×=
口算 56×= 2﹣=+= 6×= 0.25×4= 57×=÷= 1÷= 21÷=÷= 1÷= 0÷=
计算下面各题．×21×÷5×÷÷÷÷24×÷8．
计算．×9=×0= 0÷=÷= 12×=×=÷=÷=
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÷3= 12×
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