25厘米=2.5分米,
(2.5×2.5+2.5×4×4)×15,
=(6.25+40)×15,
=46.25×15,
=693.75(平方分米);
答:至少需要693.75平方分米铁皮.
用铁皮焊15个底面是边长25厘米的正方形,高4分米的长方体无盖水桶,至少要用多少铁皮?
用铁皮焊15个底面是边长25厘米的正方形,高4分米的长方体无盖水桶,至少要用多少铁皮?
数学人气:921 ℃时间:2019-08-18 21:35:58
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