由y=(x−1)(x−2)y=(x - 1)(x - 2)y=(x−1)(x−2)与xxx轴围成图形的面积是( ).
(A)12\dfrac{1}{2}21
(B)14\dfrac{1}{4}41
(C)16\dfrac{1}{6}61
(D)18\dfrac{1}{8}81
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