(1)搭2个正方形需要7根火柴棒;
搭3个正方形需要10根火柴棒;
搭4个正方形需要10根火柴棒13根;
所以搭n个这样的正方形需要3n+1根火柴棒;
(2)3n+1=31
n=30÷3
n=10;
答:照上图这样拼,31根小棒可以拼10个正方形.
(1)照上图这样拼2,3,4,…,n个正方形,分别要多少根小棒? (2)照上图这样拼,31根小棒可以拼多少个正方形?
(1)照上图这样拼2,3,4,…,n个正方形,分别要多少根小棒?
(2)照上图这样拼,31根小棒可以拼多少个正方形?
数学人气:119 ℃时间:2020-04-18 16:58:44
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