(pq/2r)^3÷2p/r^2+1/2q

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(pq/2r)^3÷2p/r^2+1/2q(pq/2r)^3÷2p/r^2+1/2q(pq/2r)^3÷2p/r^2+1/2q=(p^3q^3/8r^3)(r^2/2p)+1/2q=p^2q^3/16

(pq/2r)^3÷2p/r^2+1/2q
(pq/2r)^3÷2p/r^2+1/2q

(pq/2r)^3÷2p/r^2+1/2q
=(p^3q^3/8r^3)(r^2/2p)+1/2q
=p^2q^3/16r+1/2q
=(p^2q^4+8r)/(16qr)