(1)2×3.14×20×2,
=6.28×20×2,
=125.6×2,
=251.2(厘米);
(2)3.14×202×2,
=3.14×400×2,
=1256×2,
=2512(平方厘米);
答:一昼夜,时针的尖端所走过的路程是251.2厘米,时针所扫过的面积是2512平方厘米.
一个时钟的时针长20厘米,如果走一昼夜,那么它的尖端所走过的路程有多长?时针所扫过的面积有多大?
一个时钟的时针长20厘米,如果走一昼夜,那么它的尖端所走过的路程有多长?时针所扫过的面积有多大?
数学人气:458 ℃时间:2019-10-10 04:21:20
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