∫x[根号下(x^2-1)]dx=1/2*∫[根号下(x^2-1)]dx^2=1/2*∫[根号下(x^2-1)]d(x^2-1)令x^2-1为t,则上式化为1/2*∫[根号下t]dt已得到结果为1/3*t^(3/2)+c把x^2-1换回来得结果为1/3*(x^2-1)^(3/2) +c
令t=x^2-1x=(t+1)^2原式=∫[√t(t+1)²]d(t+1)^1=∫[t^(5/2)+2*t^(3/2)+t½][2t+2]dt=……懂不