所求的体积为 V=VI+V2 (2dx+1(q2-x2)dx 0 (2-1) 2aT. +兀ax 0 7-4√2 od 前页后页结束前页 后页 结束 ax x a x x V V V a a a π 2 d π ( )d ( 2 1) 2 2 ( 2 1) 0 1 2   − − = + − = + 所求的体积为 π . 3 7 4 2 3 π 2 2 π 3 ( 2 1) 3 2 ( 2 1) 0 2 a x a x x a a a a − =       =  + − − −