Question

[thinh phat]

dang 2

1/_6,4x+(-2,4)x=1,2

2/_2.3/4:x3.1/7:0,01

3/_3/4+1/4:x=1

4/_(x-2/3)(x+1/4)=0

5/_|x+4/5|=0

6/_|x+3/4|-3/4=0

7/_1,6-|x-0,4|=0.5

8/_(x-1/2)^2+=0

9/_(x-3)^3=8

10/_(x+1/2)^2=1/25

11/_-3^x/81=-27

12/_a/x/15=-60/x

b/x/27=2/36

Answer 1

[Nguyễn Lê Phước Thịnh]

9: =>x-3=2

=>x=5

10: =>x+1/2=1/5 hoặc x+1/2=-1/5

=>x=-7/10 hoặc x=-3/10

12:

a: =>x^2=900

=>x=30 hoặc x=-30

b: =>x=1/18*27=3/2

7: =>|x-0,4|=1,1

=>x-0,4=1,1 hoặc x-0,4=-1,1

=>x=1,5 hoặc x=-0,7