原式=(1+4+7..+58)+(.1+.4+.7+1.10……+.55+.58)
=(1+58)*20/2+(0.1+0.58)*20/2
=596.8
1.1+4.4+7.7+10.10……+55.55+58.58
1.1+4.4+7.7+10.10……+55.55+58.58
数学人气:273 ℃时间:2019-12-19 07:42:45
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