共有层数:
(94-40)÷3+1=19(层)
共有根数:
(40+94)×19÷2=1273(根)
堆成梯形的一堆木头,上边40根,下边94根,每层相差3根,共有()根
堆成梯形的一堆木头,上边40根,下边94根,每层相差3根,共有()根
数学人气:521 ℃时间:2020-06-02 05:10:58
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