用十字相乘法做题-10X^2Y+25XYZ-15Y^Z2X^3-13X^2-24X2A^2B^2+19AB-60第一题:-10X^2Y+25XYZ-15Y^2Z
问题描述:
用十字相乘法做题
-10X^2Y+25XYZ-15Y^Z
2X^3-13X^2-24X
2A^2B^2+19AB-60
第一题:-10X^2Y+25XYZ-15Y^2Z
答
-10X^2Y+25XYZ-15Y^Z
=(-10X+15Y)(X-Y)
2X^3-13X^2-24X
= X(2X^2-13X-24)
2A^2B^2+19AB-60
=