Question

me ajude a resolver as equações (com a conta):

A) 7.(x-2)=5(x+3)
B)2.(3x-5)-x=10-3x
C)2.(x-5)=4(x-1)=0
D)-2x-1000=0
E)1,5x+4=19
F)8x=5x+ 4,5
G)x+5,41=3,87
H)3,4x-26=x-0,92
I)0,1x+3x+0,9x=14+2x

(por favor, se não estiver claro pode me avisar, obrigada.).

Answer 1

A) 7(x-2)=5(x+3)-> 7x -14=5x +15->7x-5x=15+14-> 2x=29-> x= 29/2.
B) \\ -> 6x-10-x=10 -3x -> 6x-x+3x=10+10 -> 8x= 20 -> x = 20/8=5/2.
C) \\ ->2x -10=4x-4=0,temos que é impossível pois a igualdade de 2x-10 =4x-4 -> 4x-2x= -10+4 -> 2x = -6   -> x= -3 <-
Porém 2x-10 =0 -> 2x= 10-> x=5, absurdo.
D)-2x-1000=0 -> 2x= -1000 -> x = -1000/2= -500.
E)1,5x +4=19 -> 3/2x= 19-4 ->x = 15*2/3 -> X=10.
F) 8x= 5x+ 4,5 -> 8x-5x = 9/2 -> 3x=9/2 -> x= 3/2=1,5.
G)x+ 5,41= 3,87 -> x= 3,87- 5,41 -> x= -1,54.
H)3,4x-26=x-0,92 -> 3,4x-x=-0,92+ 26 -> 2,4x=25,08 -> x= 10,45.
I)0,1x+3x+0,9x=14+2x - >3x+0,1x+0,9x -2x= 14 -> 2x + 14 -> x=14/2=7.