解设:每枚硬币厚为X cm. (2.4/2)平方*3.14 *20*X=18.0864 1.44*3.14*20*X=18.0864 90.432 * X =18.0864 X=18.0864/90.432
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解设:每枚硬币厚为X cm. (2.4/2)平方*3.14 *20*X=18.0864 1.44*3.14*20*X=18.0864 90.432 * X =18.0864 X=18.0864/90.432