Question

[(x+3)-4]-8+x=11
[(3x-12):(-3)+5]+x=9
[-7+2 (-2x+1)-x]:(-5)+9=10
Rezolvati in Z

Answer 1

Sper ca te-am ajutat!

Answer 2

Răspuns

Explicație pas cu pas:

[ ( x + 3 ) - 4 ] - 8 + x = 11

x + 3 - 4 - 8 + x = 11

2 x - 9 = 11

2 x = 11 + 9

2 x = 20

x = 20 : 2 ⇒     x = 10 ∈ Z

Verific:

[( 10 + 3 ) - 4 ] - 8 + 10 = 11

= ( 13 - 4 )  + 2 =

= 9 + 2 =

= 11

_______________________

[ ( 3 x - 12 ) : ( - 3 ) + 5 ] + x = 9

[ ( x - 4 ) x 3 : ( - 3 ) + 5 ] + x = 9

( - x + 4 + 5 ) + x = 9

( - x + x ) + 9 = 9  

0 + 9 = 9  ∀ x ∈ Z

_____________________

[ - 7 + 2 ( - 2 x + 1 ) - x ] : ( - 5 ) + 9 = 10

( - 7 - 4 x + 2 - x ) : ( - 5 ) = 10 - 9

- 5 x - 5 = 1 × ( - 5 )    l ( - 5 )

x + 1 = 1

x = 1 - 1

x = 0 ∈ Z