1988分之1+1988分之2+1988分之3+……+1988分之1988
1个回答
1988分之1+1988分之2+1988分之3+……+1988分之1988
=1988分之1×(1+2+3+……+1988)
=1988分之1×(1+1988)×1988÷2
=994.5
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