64*（x+1）³-27=0
(x+1)^3-(3/4)^3=0
(x+1-3/4)[x^2+(x+1)*(3/4)+(3/4)^2]=0
(x+1/4)[x^2+(3/4)x+21/16]=0
x+1/4=0 x=-1/4
x^2+(3/4)x+21/16=0 无解
原方程的解为x=-1/4