• Matéria: Matemática
  • Autor: kauanjesusgame
  • Perguntado 7 anos atrás

me ajuda nessas contas coloquem as contas

a)9+2.(5x-4)=21

b)10x+4.(3-2x)-6=8

c)3.(5+3x)+5.(-x-1)=22

d)2.(9x-4)-7+(6-5x).3=18

Respostas

respondido por: marcelolima29
2

Resposta:

a)

9+2.(5x-4)=21

9+2(5x)-2(4)=21

9+10x-8=21

10x=21+8-9

10x=21-1

10x=20

x=20/10

x=2

b)

10x+4.(3-2x)-6=8

10x+4(3)-4(2x)-6=8

10x+12-8x-6=8

10x-8x=8+6-12

2x=2

x=2/2

x=1

c)

3.(5+3x)+5.(-x-1)=22

3(5)+3(3x)+5(-x)-5(1)=22

15+9x-5x-5=22

4x=22-15+5

4x=22-10

4x=12

x=12/4

x=3

d)

2.(9x-4)-7+(6-5x).3=18

2(9x)-2(4)-7+3(6)-3(5x)=18

18x-8-7+18-15x=18

18x-15x=18-18+7+8

3x=15

x=15/3

x=5

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