圆的半径由4厘米变成9厘米,圆的面积增加多少平方厘米?
圆的半径由4厘米变成9厘米,圆的面积增加多少平方厘米?
数学人气：945 ℃时间：2019-12-04 10:22:57
优质解答
65π,约204.2
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