Question

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$125 ^{3} - (5y - 1) \times (25y ^{2} + 5y + 1) + y + 4$
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Answer 1

$125^3-(5y-1)(25y^2+5y+1)+y+4=125^3-(125y^3-1)+y+4=\\\\\\1953125-125y^3+1+y+4=-125y^3+y+1953130$