Odpowiedź :
Odpowiedź:
c) 3x /2 +x/6 - 2x/9=13 /*18
27x +3x -4x = 234
26x= 234 /:26
x= 9
spr... 3*9/2 + 9/6 - 2*9/9= 13
27/2 + 1 i 1/2 - 2= 13
13 i 1/2 +1 i 1/2 -2= 13
15-2= 13
13=13
L=P
d) x-3 /3= 4 /*3
x-3= 12
x= 12+3
x= 15
spr... 15-3 /3 = 4
12/3= 4
4=4
L=P
Szczegółowe wyjaśnienie:
3.
c)
[tex]\frac{3x}{2}+\frac{x}{6}-\frac{2x}{9} = 13 \ \ |\cdot 18\\\\18\cdot\frac{3x}{2}+18\cdot\frac{x}{6}-18\cdot\frac{2x}{9} = 13\cdot18\\\\27x + 3x-4x = 234\\\\26x = 234 \ \ /:26\\\\\underline{x = 9}[/tex]
d)
[tex]\frac{x-3}{3} = 4 \ \ |\cdot3\\\\x-3 = 12\\\\x = 12 + 3\\\\\underline{x =15}[/tex]