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数学
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用直径为4cm的圆钢,铸造三个直径为2cm,高为16cm的圆柱形零件,则需要截取的圆钢长______cm.
人气:291 ℃ 时间:2019-08-21 16:57:45
解答
设截取的圆钢长xcm.
根据题意得:
π×(
4
2
)
2
x=3×π×(
2
2
)
2
×16
,
4x=48,
解得:x=12.
故答案为:12.
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