底面积不变,表面积增量取决于圆柱侧面增量
3.14*10*2=62.8
一个圆柱的底面直径是10cm,若高增加2cm,则表面积增加（ ）cm^n
一个圆柱的底面直径是10cm,若高增加2cm,则表面积增加（ ）cm^n
晚上8：00前必须回答完毕,
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数学人气：213 ℃时间：2019-09-16 20:28:43
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