x²+(1+2i)x+3m+i=0
x²+x+3m+(2x+1)i=0
所以x=-1/2
x²+x+3m=0
1/4-1/2+3m=0
3m=1/4
m=1/12 x²+(1+2i)x+3m+i=0
x²+x+3m+(2x+1)i=0
所以x=-1/2
x²+x+3m=0
1/4-1/2+3m=0
3m=1/4
m=1/12