问题
填空题
一堆钢管堆放成梯形,顶层8根,底层12根,每相邻两层相差一根,一共有钢管______根.
答案
(8+12)×(12-8+1)÷2,
=20×5÷2,
=50(根);
答:这堆钢管一共有50根.
故答案为:50.
一堆钢管堆放成梯形,顶层8根,底层12根,每相邻两层相差一根,一共有钢管______根.
(8+12)×(12-8+1)÷2,
=20×5÷2,
=50(根);
答:这堆钢管一共有50根.
故答案为:50.