PROSZĘ DAM NAJ I DUŻO PUNKTÓW! WYKONA KTOŚ TE 4 PODPUNKTY​



PROSZĘ DAM NAJ I DUŻO PUNKTÓW WYKONA KTOŚ TE 4 PODPUNKTY class=

Odpowiedź :

Magda

Odpowiedź:

[tex]a)\\\\\frac{12-x}{4}=\frac{x+4}{12}\\\\12(12-x)=4(x+4)\\\\144-12x=4x+16\\\\-12x-4x=16-144\\\\-16x=-128\ \ |:(-16)\\\\x=8\\\\\\b)\\\\\frac{3x-2}{4}=\frac{4x-5}{3}\\\\3(3x-2)=4(4x-5)\\\\9x-6=16x-20\\\\9x-16x=-20+6\\\\-7x=-14\ \ |:(-7)\\\\x=2[/tex]

[tex]c)\\\\\frac{x-3}{6}=2(3x+1)\\\\\frac{x-3}{6}=6x+2\ \ |\cdot6\\\\x-3=36x+12\\\\x-36x=12+3\\\\-35x=15\ \ |:(-35)\\\\x=-\frac{15}{35}\\\\x=-\frac{3}{7}\\\\\\d)\\\\3(1-\frac{x}{3})=\frac{5x-1}{9}\\\\3-x=\frac{5x-1}{9}\ \ |\cdot9\\\\27-9x=5x-1\\\\-9x-5x=-1-27\\\\-14x=-28\ \ |:(-14)\\\\x=2[/tex]

Odpowiedź:

a)

(12 - x)/4 = (x + 4)/12

12(12 - x) = 4(x + 4)

144 - 12x = 4x + 16

- 12x - 4x = 16 - 144

- 16x = - 128

16x = 128

x = 128/16 = 8

b)

(3x - 2)/4 = (4x - 5)/3

3(3x - 2) = 4(4x - 5)

9x - 6 = 16x - 20

9x - 16x = - 20 + 6

- 7x = - 14

7x = 14

x = 14/7 = 2

c)

(x - 3)/6 = 2(3x + 1)

x - 3 = 6 * 2(3x + 1)

x - 3 = 12(3x + 1)

x- 3 = 36x + 12

x - 36x = 12 + 3

- 35x = 15

35x = - 15

x = - 15/35 = - 3/7

d)

3(1 - x/3) = (5x - 1)/9

9*3(1 - x/3 ) = 5x - 1

27(1 - x/3) = 5x - 1

27 - 27x/3 = 5x - 1

27 - 9x = 5x - 1

- 9x - 5x = - 1 - 27

- 14x = - 28

14x = 28

x = 28/14 = 2