由曲線與直線y=1,x=2所圍成的平面圖形的面積是().
A.ln3 B.2+ln3 C.ln2 D.2-ln3
A.+∞ B.π/4 C.π/6 D.π/2
等于().
A.-1/6 B.1/6 C.-1/3 D.1/3