求用主元法因式分解15x²-20xy-x+8y-2
问题描述:
求用主元法因式分解15x²-20xy-x+8y-2
答
15x²-20xy-x+8y-2
=15x^2-(20y+1)x+2(4y-1)
=[3x-(4y-1)](5x-2)
=(3x-4y+1)(5x-2)