(2m+1/5)whole cube is equal to
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by using a + b whole cube is equals to a cube plus b cube + 3 a square B plus 3aB square
Then,
Then,
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formula of (a+b)^3 = a^3+b^3+3ab(a+b)
2m^3+1/5^3+3×2m×1/5 (2m+1/5)
8m^3+1/125+6m/5×(2m+1/5)
8m^3+1/125+12m^2/5+6m/25
2m^3+1/5^3+3×2m×1/5 (2m+1/5)
8m^3+1/125+6m/5×(2m+1/5)
8m^3+1/125+12m^2/5+6m/25
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