(75x)^2=30^2+(60x)^2解方程过程
问题描述：
(75x)^2=30^2+(60x)^2解方程过程
答
(75x)^2=30^2+(60x)^2
5625x^2-900-3600x^2=0
2025x^2=900
x^2=4/9
x= 2/3,-2/3