(101+103+…+199)-(90+92+…+188)=( ) A100

Freeti2019-12-17  10

问题 (101+103+…+199)-(90+92+…+188)=( )A100B199C550D990

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答案C

解析[img]/upload/tiku/378/4269237_1.png[/img]
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