(36*x)/(5*(x^2 + 25)^(1/2)) + (18*(2*x - 40))/(5*((x - 20)^2 + 64)^(1/2)) + (105*((x - 20)^2 + 64)^
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(36*x)/(5*(x^2 + 25)^(1/2)) + (18*(2*x - 40))/(5*((x - 20)^2 + 64)^(1/2)) + (105*((x - 20)^2 + 64)^
(36*x)/(5*(x^2 + 25)^(1/2)) + (18*(2*x - 40))/(5*((x - 20)^2 + 64)^(1/2)) + (105*((x - 20)^2 + 64)^
(36*x)/(5*(x^2 + 25)^(1/2)) + (18*(2*x - 40))/(5*((x - 20)^2 + 64)^(1/2)) + (105*((x - 20)^2 + 64)^
题目是不是没完整啊.后面应该还有个1/2吧?