计算:(-3y)^2(2y+1)-(3y-5)(3y+4)
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计算:(-3y)^2(2y+1)-(3y-5)(3y+4)
计算:(-3y)^2(2y+1)-(3y-5)(3y+4)
计算:(-3y)^2(2y+1)-(3y-5)(3y+4)
(-3y)^2(2y+1)-(3y-5)(3y+4)
=9y²(2y+1)-(9y²-3y-20)
=18y³+9y²-9y²+3y+20
=18y³+3y+20
原式=18y^3+9y^2-9Y^2+3y+20
=18y^3+3y+20
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