Toán Rút gọn biểu thức (6x-5)(x+8)-(3x-1)(2x+3)-9(4x-3) 18/11/2021 By Gianna Rút gọn biểu thức (6x-5)(x+8)-(3x-1)(2x+3)-9(4x-3)
`(6x-5)(x+8)-(3x-1)(2x+3)-9(4x-3)` `=6x(x+8)-5(x+8)-3x(2x+3)+(2x+3)-9.4x-9.(-3)` `=6x^2+48x-5x-40-6x^2-9x+2x+3-36x+27` `=(6x^2-6x^2)+(48x-5x-9x+2x-36x)+(-40+3+27)` `=-10` Trả lời
$(6x-5)(x+8)-(3x-1)(2x+3)-9(4x-3)$
$=6x²+48x-5x-40-6x²-9x+2x+3-36x+27$
$=-40+3+27$
$=-10$
`(6x-5)(x+8)-(3x-1)(2x+3)-9(4x-3)`
`=6x(x+8)-5(x+8)-3x(2x+3)+(2x+3)-9.4x-9.(-3)`
`=6x^2+48x-5x-40-6x^2-9x+2x+3-36x+27`
`=(6x^2-6x^2)+(48x-5x-9x+2x-36x)+(-40+3+27)`
`=-10`