Question

Answer 1

`a, = 3/5 + 1 + 2/5`

`= 2`.

`b, (sqrt x - 4) (|x+2| -1) (x^2-3) = 0`

`TH_1: sqrt x - 4 = 0 => x = +-2`

`TH_2: |x+2| - 1 =  0 => |x+2| = 1 => x = -1` hoặc `-3`.

`TH_3: x^2 - 3 = 0 => x^2 = 3 => x = sqrt 3` hoặc `sqrt -3`.

Answer 2

a) \(P=\sqrt{\dfrac{9}{25}}+2018^0+\left|-0,4\right|\\ =\dfrac{3}{5}+1+0,4=2\)