(1+1992)+(1+1992×2)+(1+1992×3)+…+(1+1992×15)．-数学

题目简介

(1+

)+(1+

×2)+(1+

×3)+…+(1+

×15)．

题型：解答题难度：中档来源：不详

(1+class="stub"19

)+(1+class="stub"19

×2)+(1+class="stub"19

×3)+…+(1+class="stub"19

×15)，
=15+class="stub"19

×(1+2+3+…+15)，
=15+class="stub"19

×120，
=39class="stub"18

．