1/3+2/3+3/3+…+50/3
=1/3(1+2+3+…+50)
=1/3(1+50)*50/2
=425
计算:3分之1+3分之2+3分之3+3分之4...+3分之50
计算:3分之1+3分之2+3分之3+3分之4...+3分之50
数学人气:910 ℃时间:2020-06-14 05:31:02
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