数学题:求MN的长是多少
- 时间:2020-05-13 15:05:48
- 分类:数学世界
- 阅读:138 次
数学题:如图半圆的直径为20厘米,已知阴影A比阴影B的面积少27平方厘米。求MN的长是多少?

数学题解答:
A比B的面积少27平方厘米,A和B都加上直径上方的空白部分,就分别变成了三角形和半圆。
所以三角形比半圆少27平方厘米,根据这一点可以列方程解决。
设MN为x厘米。
等量关系式:三角形面积 + 27 = 半圆面积
20x÷2 + 27 = 3.14×(20÷2)2÷2
10x+27=157
x=13
答:MN的长是13厘米。
算术解法:

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