Question

数学题求教.写明理由!

Answer 1

设AE=x千米,则BE=(25-x)千米,

由勾股定理及DE=CE得

225+x^2=100+(25-x)^2,

∴225+x^2=100+625-50x+x^2,

∴50x=500,

∴x=10.