Question

Answer 1

a, 

\(\Leftrightarrow2x-6,02=3,87;\Rightarrow2x=3,87+6,02=0,89\)

\(\Rightarrow x=9,89:2=4,945\)

Answer 2

a: =>2x=8,03-6,4+6,02=7,65

hay x=3,825

b: =>3x:1,5=5

=>3x=7,5

hay x=2,5

c: =>1,25x=1,25

hay x=1

d: =>7x-7=3x

=>4x=7

hay x=7/4

Answer 3

b, \(\Leftrightarrow3x:1,5=4,52\Rightarrow3x=4,52.1,5=6,78\)

\(\Rightarrow x=6,78:3=2,26\)

Answer 4

d, \(\dfrac{x-1}{x}=\dfrac{3}{7}\\ \Leftrightarrow7\left(x-1\right)=3x\)

\(\Leftrightarrow7x-7-3x=0\)

\(\Leftrightarrow4x-7=0;\Rightarrow x=\dfrac{7}{4}\)