(5y+1)(5y^2-5y+1)-5(1+2y)(1-2y)
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(5y+1)(5y^2-5y+1)-5(1+2y)(1-2y)
(5y+1)(5y^2-5y+1)-5(1+2y)(1-2y)
(5y+1)(5y^2-5y+1)-5(1+2y)(1-2y)
原式=25y³-25y²+5y+5y²-5y+1-5+20y²
=25y³-4
(5y+1)(5y^2-5y+1)-5(1+2y)(1-2y)
=25y³-25y²+5y+5y²-5y+1-5(1-4y²)
=25y³-20y²+1-5+20y²
=25y³-4
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