5³+3³+6³-3×5×3×6 solve it by a³+b³+c³-3×abc formula and do step by step
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hi good morning have a good day
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a^3+b^3+c^3-3abc=(a+b+c)(a^2+b^2+c^2-ab-bc-ca)
so,
5^3+3^3+6^3-3×5×3×6
=(5+3+6)(5^2+3^2+6^2-5×3-3×6-6×5)
=14(25+9+36-15-18-30)
=14(70-63)
=14×7
=98
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