(2r分之pq)³÷r²分之2p+ 2q分之1
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(2r分之pq)³÷r²分之2p+ 2q分之1
(2r分之pq)³÷r²分之2p+ 2q分之1
(2r分之pq)³÷r²分之2p+ 2q分之1
(2r分之pq)³÷r²分之2p+ 2q分之1
=(p³q³/8r³)×r²/2p+1/2q
=p²q³/16r+1/2q
=p²q的4次方/16qr+8r/16qr
=(p²q的4次方+8r)/16qr