Đáp án:
`d. (2x-3)(x^2-5x+1)`
`= 2x(x^2-5x+1)-3(x^2-5x+1)`
`= 2x^3-10x^2+3x-3x^2+15x-3`
`= 2x^3-13x^2+17x-3`
`e. (2x-3)(x^2-x-3)`
`= 2x(x^2-x-3)-3(x^2-x-3)`
`= 2x^3-2x^2-6x-3x^2+3x+9`
`= 2x^3-5x^2-3x+9`
`f. (2x^2-3x)(x^2-x-3)`
`= 2x^2(x^2-x-3)-3x(x^2-x-3)`
`= 2x^4-2x^3-6x^2-3x^3+3x^2+9x`
`= 2x^4-5x^3-3x^2+9x`
`g. (1/2a^2b-3a)(2ab^2-4a^2b-5a)`
`= 1/2a^2b(2ab^2-4a^2b-5a)-3a(2ab^2-4a^2b-5a)`
`= a^3b^3-2a^4b^2-5/2a^3b-6a^2b^2+12a^3b+15a^2`
`= a^3b^3-2a^4b^2+19/2a^3b-6a^2b^2+15a^2`