Matemática
eallves
16

Resolva as equações abaixo involvendo frações: A) X/2+ X/5= 5 B) X/5 + 2/3 = 8 C) X/2 + X/3 + X/4 = `13 D) X+3/ 4 + X+ 1/6 = 3 E) 2. (X+1 )/3 = 4 (2x + 1 )/9 = 9 F) x-2/5 + x+3/2= x+ 5/5 G) 3x + 9 /4 - 5x + 16/ 7 = 0

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(1) Respostas
KetlenSouza

a) x/2 + x/5 = 5 5x/10 + 2x/10 = 50 /10 7x=50 x = 50/7 b) x/5 + 2/3 = 8 3x/15 + 10/15 = 120/15 3x = 120-10 x = 110/3 c) x/2 + x/3 x/4 = 13 6x/12 + 4x/12 + 3x/12 = 156 13x=156 x=156/13 x=12 d) x+3/4 + x + 1/6 = 3 3(x+3) + 12x + 2 = 36 3x + 9 +12x + 2 = 36 15x = 36 - 11 15x =25 x = 25/15 = 5/3 e)??? f) x-2/5 + x+3/2 = x+5/5 2(x-2)/10 + 5(x+3)/10 = 2(x+5)/10 2x - 4 + 5x + 15 = 2x +10 5x = 10 - 11 x = -1/5 g)3x+9/4 - 5x+16/7 =0 7(3x+9)/28 - 4(5x+16)/28 =0 21x +63 -20x - 64 =0 1x=1 x=1

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