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π*0.75^2*1.3/(4/3)*π*0.025^3
人气:316 ℃ 时间:2020-03-29 01:15:05
解答
π*0.75^2*1.3/(4/3)*π*0.025^3
=0.75^3*1.5/0.025^3
=30^3*1.3
=35100
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