12x²+23xy-35y² 十字相乘 T T

问题描述:

12x²+23xy-35y² 十字相乘 T T

12x²+23xy-35y² =(12x+35y)(x-y)

(12x+35y)(x-y)

12x²+23xy-35y²
=(12x-35y)(x+y)