扩建后草坪的底边应是多少米：为增加绿化面积，学校将一块三角形的草坪按照一定的比例进行了扩建。你能算算扩建后草坪的底边应是多少米吗？第一个三角形底边是8米，高是2米，第二个三角形高是3.5米。 怎么做？

数学题解答：此题可用比例知识解。设三角形的底是x米。

2:3.5=8:x

2x=8×3.5

x=28÷2

x=14

答：扩建后草坪的底边是14米。

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