Toán -(x+3).(x+4)+(x-1).(x+1)=10 giúp mk vs !please! 27/07/2021 By Ximena -(x+3).(x+4)+(x-1).(x+1)=10 giúp mk vs !please!
`-(x+3).(x+4)+(x-1).(x+1)=10` `-x^2-4x-3x-12+x^2+x-x-1=10` `-7x-12-1=10` `-7x-12=11` `-7x=23` `x=-23/7` Vậy `x=-23/7` Trả lời
`-(x+3)(x+4)+(x-1)(x+1)=10` `⇔-(x^2+4x+3x+12)+x^2-1=10` `⇔-x^2-4x-3x-12+x^2-1=10` `⇔-7x=23` `⇔x=-23/7` Trả lời
`-(x+3).(x+4)+(x-1).(x+1)=10`
`-x^2-4x-3x-12+x^2+x-x-1=10`
`-7x-12-1=10`
`-7x-12=11`
`-7x=23`
`x=-23/7`
Vậy `x=-23/7`
`-(x+3)(x+4)+(x-1)(x+1)=10`
`⇔-(x^2+4x+3x+12)+x^2-1=10`
`⇔-x^2-4x-3x-12+x^2-1=10`
`⇔-7x=23`
`⇔x=-23/7`