^ 表示乘方
原式=(1/2p^4q²-1/3p³q³-3/4p²q^4)/(-2/3p²)
=1/2p^4q²÷(-2/3p²)-1/3p³q³÷(-2/3p²)-3/4p²q^4÷(-2/3p²)
=1/2÷(-2/3)×(p^4÷p²)×q²-1/3÷(-2/3)×(p³÷p²)×q³-3/4÷(-2/3)×(p²÷p²)×q^4
=-3/4p²q²+1/2pq³+9/8q^4