A parking lot measures 11m by 6m.The lot is enlarged by paving a uniform border alont 3 sides of the originial lot.Find the width of the newly paved border if the total area of the new lot is 120 metres squared.请写出演算过程.
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A parking lot measures 11m by 6m.The lot is enlarged by paving a uniform border alont 3 sides of the originial lot.Find the width of the newly paved border if the total area of the new lot is 120 metres squared.
请写出演算过程.
设三个方向同时扩展x米.有两种方案
第一:一条11m的边保持不动,则方程为(11+2x)(6+x)=120
第二:一条6m的边保持不动,则方程为(6+2x)(11+x)=120
两个方程都可以解出来.然后也就知道新的边界长度了.
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