em tính bình thuownfh nha

$$\begin{gathered} \sqrt[2]{{(-3)}^6} +\sqrt{\sqrt{{\left(x-2\right)}^8}}= 27 +\sqrt{\sqrt{{\left({\left(x-2\right)}^4\right)}^2}} =27+\sqrt{({(x-2)}^2{)}^2} =27+{\left(x-2\right)}^2 \\ =27+x^2-4x+4= x^2-4x+31 \end{gathered}$$

đây nhé b 

a) 90+9=99

b) 36-25=11

605,26+217,3=822,56

Ta có: 18^2= 324

            10^3=1000

Mà 324<1000    =>18^2<10^3

giá cả thi trường

1) (5+2005)+(1997-1997)=2010

2) (4567-4567) +1234+4=1238

3) (1579-1579) -53 +53 +(2001-2001) +(54-54) -15=-15

5) (13579-13579) +53-14= 39

6) (14573-14573) 5-4=1

7) (5847-5847)+(5-5)+6=6

8) (1993-1993)+(35-35)-17=-17

9) (48725-48725) +300-357=-57

10) (3579-3579)+(49-49) +5+5

3-2x=2x-1

<=> 4=4x
=>x=1