Lakomypatryk52
Rozwiązane

PROSE O POMOC
ROZWIĄZ RÓWNANIE I SPRAWDŻ ROZWIĄZNIE
STR 90 ZAD 1
POZ B
6*X=2*X-8
8*X=9+5*x
7*x=2*X-20
POZ C
8-3*X=6*X-10
7*X-4=9+8*X
-5+7*X=2*X-20



Odpowiedź :

Basetla

POZ. B

[tex]1)\\6x=2x-8\\\\6x-2x = -8\\\\4x = -8 \ \ \ |:4\\\\\boxed{x = -2}\\\\Spr.\\L = 6\cdot(-2) = -12\\P = 2\cdot(-2)-8 = -4-8 = -12\\L = P[/tex]

[tex]2)\\8x=9+5x\\\\8x-5x = 9\\\\3x = 9 \ \ \ |:3\\\\\boxed{x = 3}\\\\Spr.\\L = 8\cdot3 = 24\\P = 9+5\cdot3 = 9+15 = 24\\L = P[/tex]

[tex]3)\\7x=2x-20\\\\7x-2x = -20\\\\5x = -20 \ \ \ |:5\\\\\boxed{x = -4}\\\\Spr.\\L = 7\cdot(-4) = -28\\P = 2\cdot(-4)-20 = -8-20 = -28\\L = P[/tex]

POZ. C

[tex]1)\\8-3x = 6x-10\\\\-3x-6x = -10-8\\\\-9x = -18 \ \ \ |:(-9)\\\\\boxed{x = 2}\\\\Spr.\\L = 8-3\cdot2 = 8-6 = 2\\P = 6\cdot2-10 = 12-10 = 2\\L = P[/tex]

[tex]2)\\7x-4 = 9+8x\\\\7x-8x = 9+4\\\\-x = 13 \ \ \ |:(-1)\\\\\boxed{x = -13}\\\\Spr.\\L = 7\cdot(-13)-4 = -91 - 4 = -95\\P = 9+8\cdot(-13) = 9 -104 = -95\\L = P[/tex]

[tex]3)\\-5+7x = 2x-20\\\\7x-2x = -20+5\\\\5x = -15 \ \ \ |:5\\\\\boxed{x = -3}\\\\Spr.\\L = -5 + 7\cdot(-3) = -5-21 = -26\\P = 2\cdot(-3)-20 = -6-20 = -26\\L = P[/tex]

Inne Pytanie