if x = 40, y = 43, z = 47 , find x³ + y³ +z³ - 3xyz
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x³ + y³ +z³ - 3xyz
(40)³ + (43)³ + (47)³- 3(40)(43)(47)
64000 + 79507 + 103823 - 242520
4810
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