求定积分∫−13∣2−x∣dx\int_{-1}^{3} |2 - x|dx∫−13∣2−x∣dx.
若f(x+3)=x2+6x+11f(x + 3)=x^2 + 6x + 11f(x+3)=x2+6x+11，求f(x)f(x)f(x).
由方程ey−y=xe^y - y = xey−y=x所确定的隐函数y=y(x)y = y(x)y=y(x)的导数为y′=y' =y′=（ ）.
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