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( 4 pieriastek sześcienny 72-4pierwiastek szcześcienny 125 )*2pieriastek sześcienny 1/9=
(4∛72-4∛125)·2∛(¹/₉)=(4∛8·∛9-4·5)·2∛¹/₉=(8∛9-20)·2∛¹/₉=16-40∛¹/₉