Question

determinati solutiile ecuatilor (cu rezolvare) 1.... 7x+4+2(x-5)=8(x+1) 2....3(2x+3)+2(3x+2)=9x+4....... 3... -3x+5+6(-x+1)=-4(x+6) va rog ajutati ma!!!

Answer 1

Răspuns:

Explicație pas cu pas:

1).    7 x + 4 + 2 ( x - 5)= 8(x+1)

       7 x + 4 + 2 x - 10 = 8 x + 8

       9 x - 6 = 8 x + 8

        9 x - 8 x = 8 + 6

           x = 14

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2).

3(2x+3)+2(3x+2)=9x+4

6x + 9 + 6x+4 = 9 x + 4

12 x + 13 = 9 x + 4

12 x - 9 x = 4 - 13

3 x = - 9

x = ( - 9 ) : 3

x = - 3

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3)>

- 3 x + 5 + 6 ( - x + 1 ) = - 4 ( x + 6 )

- 3 x + 5 - 6 x + 6 = - 4 x - 24

- 9 x + 11 = - 4 x - 24

- 9 x + 4 x = - 24 - 11

- 5 x = - 35

x = ( - 35 ) : ( - 5 )

x = 7

Answer 2

=== echivalent 1). 7x+4+2(x+1)=8(x+1)=== 7x+4+2x+2= 8x+8=== x= 2

2). 3(2x+3)+2(3x+2)=9x+4=== 6x+9+6x+6=9x+4=== 3x=-11=== x= - 11/3

3). - 3x+5+6(-x+1)=-4(x+6)=== 3x+5-6x+6= - 4x-24=== x=-35