4(x-3)²20(x-3)+25=0

问题描述:

4(x-3)²20(x-3)+25=0
是4(x-3)²-20(x-3)+25=0

4(x-3)²-20(x-3)+25=0
[2(x-3)-5]^2=0
x=11/2 (二重根)