Zad.6 na teraz proszeeeeeeeeeeeee
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Odpowiedź:
mi wychodzi tak jak poniżej tylko zastanawiam się nad tym podpunktem e)
6.
a) x+(x+2)+2(x-1)=24
x+x+2+2x-2=24
4x=24 / :4
x=6
b) 2(3n+2)+2*3n+2(3n+1)=42
6n+4+6n+6n+2=42
18n=42-6
18n=36 / :18
n=2
c) 2(3x+2)+2(2x-1)=52
6x+4+4x-2=52
10x=50 / :10
x=5
d) 2(3y-6)+2(y+1)+2(y-1)=28
6y-12+2y+2+2y-2=28
10y=28+12
10y=40 / :10
y=4
e)
[tex]3y + 5y - 2 + 4 \frac{1}{6} y + \frac{2}{3} = 11[/tex]
[tex]12 \frac{1}{6} y = 11 + 2 - \frac{2}{3} [/tex]
[tex]12 \frac{1}{6} y = 12 \frac{1}{3} \: \: \: \: \: \div 12 \frac{1}{6} [/tex]
[tex]y = \frac{73}{74} [/tex]
f) 4a+0.75+2*3+0.5a=15.75
4.5a=15.75-6-0.75
4.5a=9 / :4.5
a=2