将一个正方形纸片剪去一个宽4cm的长条
- 时间:2020-05-16 19:48:28
- 分类:数学世界
- 阅读:134 次
数学问题:将一个正方形纸片剪去一个宽4cm的长条后,再从长方形纸片上剪下一个宽5cm的长条,剪下的两个长条面积相等,长条的面积是多少?
数学题解答:先画图,和图形有关的题目,如果能够先画出图形,则对于理解题意和解答题目都很有帮助。

设正方形的边长为x厘米。
则有:4x=5(x-4)
解这个方程,得x=20,即正方形边长为20厘米。
据此算出长条面积为:20×4=80(平方厘米)或(20-4)×5=80(厘米),问题得到解决。
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