1 m=-1
2 当x=0时,y=3/2
当y=0时,1/2x²-2x+3/2=0
x²-4x+3=0,∴(x-1)(x-3)=0
x1=1,x2=3
∴A(1,0),B(3,0),C(0.3/2)
∴S=1/2×(3-1)×3/2=3/2