(2+12)×(12-2+1)÷2
=14×11÷2
=77(根);
答:这堆钢管一共有 77根.
故答案为:77.
一堆钢管,最上层有2根,最下层有12根,相邻两层相差1根,这堆钢管一共有_根.
一堆钢管,最上层有2根,最下层有12根,相邻两层相差1根,这堆钢管一共有______根.
数学人气:220 ℃时间:2020-02-03 08:33:01
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