$$原式=(\frac{cx}{a}+(\frac{d}{a}-\frac{bc}{a^2})\ln|ax + b|)|^R_L $$

一行题解：

a == 0 ? x / b * (c * x / 2 + d) : 1 / a * (c * (a * x + b) / a - (b * c / a - d) * log(abs(a * x + b)));