从上边剪下一块直径是80厘米的圆片
- 时间:2020-05-16 11:04:24
- 分类:数学世界
- 阅读:99 次
数学题:一块长方形薄钢板长2.4米、宽1米、重6千克,从上边剪下一块直径是80厘米的圆片,这块圆片的质量是多少千克?
数学题解答:在厚度一定的情况下,钢板的质量和钢板的面积有关,面积越大,质量越重。也就是说,质量和面积成正比例。所以就可以用方程来解答这道题。
设这块圆片质量为X千克。80厘米=0.8米
X : [3.14×(0.8÷2)2]=6 : (2.4×1)
X=1.256
答:这块圆片的质量是1.256千克。
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