x+x²=5000 x=?

问题描述:

x+x²=5000 x=?

(x+1/2)²=5000+1/4
x=√(20001/4)-0.5
x=(√20001 -1)/2请说明一下,我有点不明白x²+(2×1/2)x+1/4=5000+1/4(x+1/2)²=5000+1/4x=√(20001/4)-0.5 x=(√20001 -1)/2