从101一直加到1002是多少
1个回答
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101+102+103+...+199
=99*100+99
=9999
200+201+202+...+299
=100*200+99
=20099
300+301+302+...+399
=100*300+99
=30099
400+401+402+..+499
=100*400+99
=40099
....................
900+901+902+...+999
=100*900+99
=90099
1000+1001+1002=3003
9999+20099+30099+...90099
=9900+20000+30000+...+90000+99*9
=450791
450791+3003=453794
=99*100+99
=9999
200+201+202+...+299
=100*200+99
=20099
300+301+302+...+399
=100*300+99
=30099
400+401+402+..+499
=100*400+99
=40099
....................
900+901+902+...+999
=100*900+99
=90099
1000+1001+1002=3003
9999+20099+30099+...90099
=9900+20000+30000+...+90000+99*9
=450791
450791+3003=453794
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