Question

Gente me ajuda em tarefa para amanhã!!!!!

Answer 1

a) 3 1 11
-----+------= ------
4 x 12


9x+12=11x
-------------------
12x

9x+12=11x
9x-11x+12=0
-2x+12=0
-2x=12
x=12/-2
x=-6


b)x+3=1+1-3x
----- --- ------
x 1 2x

2+6=2x+1-3x
-----------------------
2x

2+6=2x+1-3x
-2x+3x+2+6-1
x= 7


c)1 + 3 = x-1
-----------------------
6x 2x 4x^2


2+ 18= 3^2-3x^2
--------------------
12x

2+18=9-9^2
9x^2+2+18-9=0
9x^2+20-9=0

/\=b^2-4.a.b
200-4.9.20
200-720
-520