x2-6x+9/x2-4 x2-4x/x2-8x+16 2是平方 /是分数线

问题描述:

x2-6x+9/x2-4 x2-4x/x2-8x+16 2是平方 /是分数线

x2-6x+9/x2-4
=(x-3)²/(x+2)(x-2)
x2-4x/x2-8x+16
=x(x-4)/(x-4)²
=x/(x-4)