Question

15 mu 3+5.15 mu 2-5 mu 3

Answer 1

15 mũ 3 + 5 x 15 mũ 2 -5 mũ 3

= 3375 + 5 x 225 - 125

= 3375 + 1125 -125

= 4500 - 125

= 4375

Answer 2

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Answer 3

\(15^3+5\cdot15^2-5^3\)

\(=5^3\cdot3^3+5\cdot5^2\cdot3^2-5^3\)

\(=5^3\left(3^3+3^2-1\right)=125\cdot\left(27+9-1\right)=125\cdot35\)

=4375