4、如果分式m-1除m²+1的值为0,那么m=
问题描述:
4、如果分式m-1除m²+1的值为0,那么m=
2、x²+(p+q)x+pq型进行因式分解(1)x²-3x-4 (2) x²-3x+2 (3) x²-4x-12 (4) x²+x-12
答
4、分子为0,得
m-1=0
m=1
(1)x²-3x-4
=(x-4)(x+1)
(2) x²-3x+2
=(x-1)(x-2)
(3) x²-4x-12
=(x+2)(x-6)
(4) x²+x-12
=(x+4)(x-3)