Đáp án:
`1)-8`
`2)35`
Giải thích các bước giải:
`1)(3x-1)(2x+3)-(x-5)(6x-1)-38x`
`=6x²+9x-2x-3-(6x²-x-30x+5)-38x`
`=6x²+9x-2x-3-6x²+x+30x-5-38x`
`=(6x²-6x²)+(9x-2x+x+30x-38x)+(-3-5)`
`=-8`
`2)(5x-2)(x+1)-(x-3)(5x+1)-17(x-2)`
`=5x²+5x-2x-2-(5x²+x-15x-3)-17x+34`
`=5x²+5x-2x-2-5x²-x+15x+3-17x+34`
`=(5x²-5x²)+(5x-2x-x+15x-17x)+(-2+3+34)`
`=35`