( a-b)=4, ab=45,find Acube -Acube
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(a-b)³=a³-b³-3ab(a-b)
(4)³=a³-b³-3×45(4)
64=a³-b³-540
a³-b³=540+64
a³-b³=604
(4)³=a³-b³-3×45(4)
64=a³-b³-540
a³-b³=540+64
a³-b³=604
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