通项表达式: ∫02x0(x−x0)dx=0\int_{0}^{2x_0}(x-x_0)dx=0∫02x0(x−x0)dx=0 其对应的图形: 本质:图形上下面积正负抵消;注意:x轴上面的积分>0,x轴下面的积分<0(也就是面积可正可负); 举例:1、∫01(x−12)dx=0\int_{0}^{1}(x-\frac{1}{2})dx=0∫01(x−21)dx=0 2018’ 2、∫02(x−1)dx=0\int_{0}^{2}(x-1)dx=0∫02(x−1)dx=0 3、∫04(x−2)dx=0\int_{0}^{4}(x-2)dx=0∫04(x−2)dx=0