Question

Tìm x:

( 1 - 3/10 - x ) : ( 19/10 - 1 - 2/ 5 ) + 4/5 = 1 

Các bạn giải nhanh giúp mk nha!!!

Answer 1

( 1 - 3/10 - x ) : ( 19/10 - 1 - 2/ 5 ) + 4/5 = 1 

=> (7/10 - x) : (9/10 - 2/5) = 1 - 4/5

=> (7/10 - x) : 1/2              = 3/5

=> (7/10 - x)                      = 3/5 : 1/2 

=> 7/10 - x                         = 6/5

=> x                                   = 7/10 - 6/5

=> x                                   = -1/2

Answer 2

ko ghi lại đề

=>(7/10-x):1/2+4/5=1

=>(7/10-x):1/2=1/5

=>7/10-x=1/10

=>x=3/5

Answer 3

( 1 - 3 / 10 - x ) : ( \(\frac{19}{10}\)- 1 - \(\frac{2}{5}\)) + \(\frac{4}{5}\)= 1

=> ( \(\frac{7}{10}\)- x ) : \(\frac{1}{2}\)+  \(\frac{4}{5}\)= 1

=> ( \(\frac{7}{10}\)- x ) : \(\frac{1}{2}\)= \(\frac{1}{5}\)

=> \(\frac{7}{10}\)- x  = \(\frac{1}{10}\)

=> x = \(\frac{3}{5}\)