因式分解x^2-13x+12

题目

因式分解x^2-13x+12
jie
guo cheng

答案

又是十字交叉
x^2-13x+12=(x-12)(x-1)
X -12
X -1
十字相乘还要过程!
x^2-13x+12=（x^2-12x）-(x-12)=x(x-12)-(x-12)=(x-12)(x-1)