sinθ=y/√3,cosθ=x/2,x²/4+y²/3=1,y＝x－1,3x²+4(x-1)²-12=0,7x²-8x-8=0,x1+x2=8/7,x1x2=-8/7,(x1-x2)²=64/49+224/49=288/49,3(y+1)²+4y²-12=0,7y²+6y-9=0,y1+y2=-6/7,y1y2=-9/7,(y1-y2)²=36/49+252/49=288/49,AB=√(576/49)=24/7,曲线C所截弦AB长为24/7.