Question

tìm x e Z, BIẾT

a, x+5=-2+11

b, -3x=-5+29

c,|x-9|=-2+17

d, |x|-9=-2+17

e,|x+19|+|x+5|+|x+2011|=4x

Answer 1

kb nha

Answer 2

a, x+5=-2+11

=> x + 5 = 9

=> x = 4

b, -3x=-5+29

=> -3x = 24

=> x = -8

c,|x-9|=-2+17

=> |x-9| = 15

=> x - 9 = 15 hoặc x - 9 = -15

=> x = 24 hoặc x = -6

d, |x|-9=-2+17

=> |x| - 9 = 15

=> |x| = 24

=> x = 24 hoặc x = -24
 

e,|x+19|+|x+5|+|x+2011|=4x 

|x + 19| > 0 ; |X + 5| > 0 ; |x + 2011| > 0

=> |x + 19| + |X + 5| + | x + 2011| > 0

=> 4x > 0

=> x > 0

=> x + 19 + x + 5 + x + 2011 = 4x

=> 3x + 2035 = 4x

=> x = 2035

Answer 3

\(a,x+5=-2+11\)

\(\Leftrightarrow x+5=9\)

\(\Leftrightarrow x=4\)

Answer 4

a) x + 5 = -2 + 11

x + 5 = 9

x = 9 - 5 = 4

b) -3x = -5 + 29

-3x = 24

x = 24 : ( -3 )

x = -8

c) | x - 9 | = -2 + 17

| x - 9 | = 15

\(\Rightarrow\orbr{\begin{cases}x-9=15\\x-9=-15\end{cases}\Rightarrow\orbr{\begin{cases}x=24\\x=-6\end{cases}}}\)

d) | x | - 9 = -2 + 17

| x | - 9 = 15

| x | = 15 + 9 = 24

=> x = 24 hoặc x = -24

e) Thì mình chịu nha =))))