0.01+0.02+0.03+……+0.97+0.98+0.99(简算)快

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0.01+0.02+0.03+……+0.97+0.98+0.99(简算)快

0.01+0.02+0.03+……+0.97+0.98+0.99(简算)快
0.01+0.02+0.03+……+0.97+0.98+0.99(简算)

0.01+0.02+0.03+……+0.97+0.98+0.99(简算)快
0.01+0.02+0.03+……+0.97+0.98+0.99
=49*1+0.5
=49+0.5
=49.5
楼上算错了...

0.01+0.02+0.03+……+0.97+0.98+0.99
=(0.01+0.99)*99/2
=1*99/2
=99/2
=45.5
就是等差数列
(首项+末项)*项数/2

0.01(1+2+3+...+97+98+99)=0.01【(1+99)99/2】=49.5

0.01+0.02+0.03+……+0.97+0.98+0.99
=(0.01+0.99)*99/2
=1*99/2
=99/2
=49.5
就是等差数列
(首项+末项)*项数/2