Question

Answer 1

\(C=\left|x+2\right|+\left|3-x\right|+5>=\left|x+2+3-x\right|+5=10\)

Dấu = xảy ra khi -2<=x<=3

Answer 2

`C=|x-3|+|x+2|+5`

`C=|3-x|+|x+2|+5`

Vì `|3-x|+|x+2| >= |3-x+x+2|=5`

`=>|3-x|+|x+2|+5 >= 10`

  Hay `C >= 10`

Dấu "`=`" xảy ra `<=>(3-x)(x+2) >= 0` 

                          `<=>(x-3)(x+2) <= 0<=>-2 <= x <= 3`