一、利用待定系数法分解因式例1分解因式:x2+4xy-5y2+x-13y-6。解:因为x2+4xy-5y2=(x-y)(x+5y),由此可设x2+4xy-5y2+x-13y-6=(x-y+m)(x+5y+n)。将等式右边展开,得: First, the use of undetermined coefficient factorization factorial factoring factorial formula 1: x2 + 4xy-5y2 + x-13y-6. Solution: Since x2 + 4xy-5y2 = (x-y) (x + 5y), x2 + 4xy-5y2 + x-13y-6 = (x-y + m) (x + 5y + n) can be set. Expand the right side of the equation to: