Question

contas no principio aditivo e multiplicativo
a]2x=90
b]x-17=90
c]4x+10=90
d]x+8x=90
e]5x-20=+2x
f]x=2(90-x)
g]4x+30=20
h](3x-20)+50=90
I]3(x+1)=2(x=7)
J]2x+2(x+1)4+3(x+2)

Answer 1

a) 2x=90 => x=90/2 => x=45. b) x-17=90. => x=90+17 => x=107 c) 4x+10=90 => 4x=90-10 => 4x=80 => x=80/4 => x=20....... d)x+8x=90 => 9x=90 => x=90/9 => x=10. e)5x-20=2x => 5x-2x=20 => 3x=20 => x=20/3. f) x=2(90-x) => x= 180 -2x=> 3x=180 => x=180/3 => x=60. g)4x+30=20 => 4x=20-30 => 4x=-10 => x= -10/4 => x=2,5 ou 5/2. h)(3x-20)+50=90 =3x-20+50=90 => 3x= 90-30 => 3x=60=> x= 60/3 => x=20. i) 3(x+1)=2(x+7) => 3x+3=2x+14 => 3x-2x=14-3=> x=11. j)

Answer 2

Resposta:

eu não sei

desculpa.

Explicação passo a passo: