Question

十字相乘法分解因式:x²y²-5x²y-6x²

要有过程十字叉，不能直接原式等于

Answer 1

=x²(y²-5y-6)

只需分解y²-5y-6
1 -6
×
1 1
=x²(y-6)(y+1)

Answer 2

x²y²-5x²y-6x²
=x^2(y^2-5y-6)
=x^2(y-6)(y+1)