• Matéria: Matemática
  • Autor: alinekaethe
  • Perguntado 8 anos atrás

a) -4³ . 2 +3 .(-5) - 5³ . 2 .4
b) 2x - 3 = 17
c) 4x +7= x-8
d) 3 - 7 (1 - 2x) = 5 - (x-9)
e) 2 (2x + 7) + 3 (3x - 5)= 3 (4x + 5) - 1

Respostas

respondido por: 3478elc
0


 A) -4³ . 2 +3 .(-5) - 5³ . 2 .4 => - 64.2 - 15 - 125.8 => - 128 - 15 - 1000 => 1143
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b) 2x - 3 = 17 ==> 2x = 17+3 ==> 2x = 20 ==> x = 10
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c) 4x +7= x-8 ==> 4x - x = - 8 - 7 ==> 3x = - 15 ==> x = - 5
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d) 3 - 7 (1 - 2x) = 5 - (x-9) ==> 3 - 7 + 14x = 5 - x + 9

14x + x = 9 - 3 + 7 + 5 ==> 15x = 18 ==> x = 18/15
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e) 2 (2x + 7) + 3 (3x - 5)= 3 (4x + 5) - 1

4x + 14 + 9x - 15 = 12x + 15 - 1 ==> 13x - 12x = - 1 + 1

x = 0 
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