Question

EXERCICIOS DE FIXAÇÃ

B) 5X+9=2X+9 C) 5X+1 -5X=9 (D X-4X+2X=81 (E) 250 X - 500=100X+750

F) ( +26-X) +X+(28-X)=42

Answer 1

b
5x + 9 = 2x + 9
5x - 2x = 9 - 9
3x = 0
x = 0/3 =0 ****
c
5x +  1-5x = 9
+ 1 = 9  *** cj vazio
d
x - 4x + 2x = 81
- x  = 81
x = -81 ***
e
250x - 500 = 100x + 750
250x - 100x = 750 + 500
150x = 1250
x = 1250/150 = 125/15 = 25/3***
f
( 26 -x) + x + ( 28 - x ) = 42
26 - x + x + 28 - x - 42 = 0
-x + 12 = 0
x - 12 = 0
x = 12 ****