因式分解x^4y^2-13x^2y+36
问题描述：
因式分解x^4y^2-13x^2y+36
答
x⁴y²-13x²y+36
=(x²y)²-13x²y+36
=(x²y-4)(x²y-9)
答
x^4y^2-13x^2y+36
=(x^2y-4)(x^2y-9)
答
=x^4y^2-2*(13/2)x^2y+(13/2)^2 - 25/4
=(x^2y-13/2)^2 - (5/2)^2
=(x^2y-4)(x^2y-9)