Question

resolva as equaçãoes sendo x um número racional

a) 39x+78=0
b) -x+2999=7248
c) 47+38+x=119
d) -2x-1000=1200
e) -2x-1000=0
f) 350x-500+100x+750

Answer 1

Explicação passo-a-passo:

a) 39x + 78 = 0 → 39x = -78 → x = -78 : 39 → x = -2

b) -x + 2999 = 7248 → -x = 7248 - 2999 → -x = 4249 → x = -4249

c) 47 + 38 + x = 119 → x = 119 - 47 - 38 → x = 72 - 38 → x = 34

d) -2x - 1000 = 1200 → -2x = 1200 + 1000 → -2x = 2200 → x = 2200 : (-2)

   x = -1100

e) -2x - 1000 = 0 → -2x = 1000 → x = 1000 : (-2) → x = -500

f) 350x - 500 + 100x + 750 = 0 → 350x + 100x = 500 - 750 →

  450x = -250 → x = -250 : 450 → x = $-\frac{5}{9}$