来自陈建平的问题
因式分解:12x^2-5x-25x^2+6xy-8y^2
因式分解:12x^2-5x-25x^2+6xy-8y^2
1回答
2020-09-21 01:09
因式分解:12x^2-5x-25x^2+6xy-8y^2
因式分解:12x^2-5x-25x^2+6xy-8y^2
用十字相乘法最简单.
12x²-5x-2
41
3-2
12x²-5x-2=(4x+1)(3x-2)
5x²+6xy-8y²
12
5-4
5x²+6xy-8y²=(x+2)(5x-4)