计算:3y(y-4)(2y+1)-(2y-3)(4y²+6y-9)
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计算:3y(y-4)(2y+1)-(2y-3)(4y²+6y-9)
计算:3y(y-4)(2y+1)-(2y-3)(4y²+6y-9)
计算:3y(y-4)(2y+1)-(2y-3)(4y²+6y-9)
3y(y-4)(2y+1)-(2y-3)(4y²+6y-9)
=3y(2y²-7y-4)-(8y³+12y²-18y-12y²-18y+27)
=6y³-21y²-12y-8y³+36y-27
=-2y³-21y²+24y-27
=(3y^2-12y)(2y+1)-(8y^3+12y^2-18y-12y^2-18y+27)
=6y^3+3y^2-24y^2-12y-8y^3+36y-27
=-2y^3-21y^2+24y-27
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