Question

Resolva as equações. A)2-3×=-9-4× B) 350×500=100×+750 C)×+5,41=3,87 D) 3(2×-1)=-2(×+3) E) 4 (×+10)-2 (×-5)=0 F) 3,5×+8=2(×+7)

Answer 1

A) 2 - 3x = - 9 - 4x
- 3x + 4x = - 9 -2
x = - 11
S = { - 11 }
B) 350 x 500 = 100 x + 750
175000 = 100 x + 750
- 100 x = 750 - 175000
- 100 x = - 174250 . ( - 1 )
100 x = 174250
       x = 174250 / 100
       x = 1742,5
S = { 1742,5 }
C )  x + 5,41 = 3,87
x = 3,87 - 5,41
x = - 1,54
S = { - 1,54 }
D) 3( 2x - 1 ) = - 2( x + 3)
6x - 3 = - 2x - 6
6x + 2x = - 6 + 3
8x = - 3
x = - 3 / 8
S = { - 3 / 8 }
E) 4 ( x + 10 ) - 2 (x - 5 ) = 0
4x + 40 - 2x + 10 = 0
4x - 2x = - 10 - 40
2x = - 50
x = - 50/ 2
 x= - 25
S = { - 25 }
F) 3,5x + 8 = 2( x + 7)
3,5x + 8 = 2x + 14
3,5x - 2x = 14 - 8
1,5 x = 6
      x = 6 /1,5
      x = 4
S = { 4 }