原式=p^3*q^3/2*3r*3 *r^2/2p+1/2q=p^2q^3/16r+1/2q=p^2q^4/16rq+8r/16rq=8r+p^2q^4/16rp
原式=p^3*q^3/(8r^3)*r^2/2p+1/2q=p^2*q^3/8r+1/2q=(p^2*q^4+4r)/8rq
(p^3q^3/8r)*r^2/2p+1/2q=p^2q^3/8r+1/2q实在没有什么过程可写 看看吧
