V球=(4/3)*πr^3
S球=4πr^2
V大球=(4/3)*π（1^3+2^3+3^3）=(4/3)*π*36
大球的半径：r=36^(1/3)
S球=4πr^2
=4π[36^(1/3)]^2
=4π*[36^(2/3)]
=4π*[6^(4/3)
≈4*3.14*10.9
=136.904