(a+5)3= a3 + 3 × a2 × ___ + 3 × a ×(____)2 + (5)3 expand
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(a+5)^3= a^3+ 3×a^2×5 + 3×a× 5^2 + 5^3
= a^3 + 15a^2 + 75a + 125
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