计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
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计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
(2a-5b)(2a^2-3ab+b^2)
=4a³-6a²b+2ab²-10a²b+15ab²-5b³
=4a³-16a²b+17ab²-5b³
(3x+2y)(2x+3y)-(x-3y)(3x+4y)
=(6x²+13xy+6y²)-(3x²-5xy-12y²)
=6x²+13xy+6y²-3x²+5xy+12y²
=3x²+18xy+18y²
(2a-5b)(2a^2-3ab+b^2)
=4a^3-6a^2b+2ab^2-10a^2b+15ab^2-5b^3
=4a^3-16a^2b+17ab^2-5b^3
(3x+2y)(2x+3y)-(x-3y)(3x+4y)
=6x^2+9xy+4xy+6y^2-(3x^2+4xy-9xy-12y^2)
=3x^2+18xy+18y^2
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