已知一元二次方程x*x-2x+2m=0.若方程有两个实数根x1和x2
x1+x2=2
x1x2=2m
x1+3*x2=3
x1+x2+2x2=3
2+2x2=3
x2=1/2
x1=3/2
1/2*3/2=2m
m=3/8