(1)有2个零点说明
b²-4ac>0
所以
16m²-4*2(m+1)*(2m-1)>0
16m²-8(2m²+2m-m-1)>0
16m²-8(2m²+m-1)>0
16m²-16m²-8m+8>0
8-8m>0
m