d) 7-2x = 5x + 28
b) x = 8 - 3x
e) 8x–5= 9x - 5
c) 2x - 4 = 4x -2
f) 6x + 2x - 10 = 3x + 5
a) 3x + 7 = 2x +1
Jest tak jak ma być czyli nie pokolei bo zle wczytało
Na dziś!._.
Odpowiedź:
a)
3x + 7 = 2x + 1
3x - 2x -= 1 - 7
x = -6
spr.
L = 3 * (-6) + 7 = -18 + 7 = -11
P = 2 * (-6) + 1 = -12 + 1 = -11
L = P
d)
7-2x = 5x + 28
-2x - 5x = 28 - 7
-7x = 21 /:(-7)
x = -3
spr.
L = 7 - 2(-3) = 7 + 6 = 13
P = 5 * (-3) + 28 = -15 + 28 = 13
L = P
b)
x = 8 - 3x
x + 3x = 8
4x = 8 /:4
x = 2
spr.
L = 2
P = 8 - 3 * 2 = 8 - 6 = 2
L = P
e)
8x–5= 9x - 5
8x - 9x = -5 + 5
-x = 0
x = 0
spr.
L = 8 * 0 - 5 = -5
P = 9 * 0 - 5 = -5
L = P
c)
2x - 4 = 4x -2
2x - 4x = -2 + 4
-2x = 2 /:(-2)
x = -1
L = 2 * (-1) - 4 = -2 - 4 = -6
P = 4 * (-1) - 2 = -4 - 2 = -6
L = P
f)
6x + 2x - 10 = 3x + 5
8x - 3x = 5 + 10
5x = 15 /:5
x = 3
spr.
L = 6 * 3 + 2 * 3 - 10 = 18 + 6 - 10 = 24 - 10 = 14
P = 3 * 3 + 5 = 9 + 5 = 14
L = P
a)
3x + 7 = 2x +1
3x - 2x = 1 - 7
x = -6
spr.
L = 3 * (-6) + 7 = -18 + 7 = -11
P = 2 * (-6) + 1 = -12 + 1 = -11
L = P
Szczegółowe wyjaśnienie: