n*n-65n+636=0

问题描述:

n*n-65n+636=0

n²-65n+636=0
(n-53)(n-12)=0
n-53=0 n-12=0
n1=53 n2=12

n*n-65n+636=0
(n-12) (n-53)=0
解得n=12或n=53

因式分解(n-12)*(n-53)=0,得到解为12,53.