基本积分公式 ∫ x^a dx = x^(1+a) / (1+a) +C,a≠ -1
∫(x-3)√xdx
= ∫ [ x^(3/2) - 3*x^(1/2) ] dx
= x^(1+3/2) / (1+3/2) - 3 x^(1+1/2) / (1+1/2) +C
= 2/5 x^(5/2) - 2 x^(3/2) +C