`|x-2|+|x-3|+|x-4|=2 `

`37/43 . 17/29 - 29/41 . 1/2 + 9/58 : 1 6/37 - 6/29 : 1 20/21`

`(8 + 2 1/3 - 3/5) - (5+0,4) - (3 1/3 -2)`

`(2/9 - 7/12) : 3/4 + (16/9 - 5/12) : 3/4`

`-4/12 - (-13/39 - 0,25) + 0,75`

`2/5 - (4/3 + 4/5) - (-1/9 - 0,4) + 11/9`

giúp b2, b3

cmr: 2x^2+8x+26 vô nghiệm

giải hệ pp thế

\(\left\{{}\begin{matrix}3x-\dfrac{y}{2}=2\\\dfrac{x}{4}-\dfrac{y}{3}=-\dfrac{2}{3}\end{matrix}\right.\)