Odpowiedź:
b)
2r - (-6) = 4
2r + 6 = 4
2r = 4 - 6 /:2
r = -2/2 = -1
-7 + a : (-2) = -3
-1/2a = -3 + 7 /*(-2)
a = 4/(-2) = -2
(6y - 2) : (-4) = 8
-3/2y + 1/2 = 8
-3/2y = 8 - 1/2 /*(-2/3)
y = 7 1/2 * (-2/3) = 15/2 * (-2/3) = -5
c)
12 - (-2b) = 88
2b = 88 - 12 /:2
b = 76/2 = 38
-4 * (c - 17) = -48
-4c + 68 = -48
-4c = -48 - 68 /:(-4)
c = 116/4 = 29
(-3)³ * z = 81
-27z = 81 /:(-27)
z = -3
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Odpowiedź:
b)
2r - (-6) = 4
2r + 6 = 4
2r = 4 - 6 /:2
r = -2/2 = -1
-7 + a : (-2) = -3
-1/2a = -3 + 7 /*(-2)
a = 4/(-2) = -2
(6y - 2) : (-4) = 8
-3/2y + 1/2 = 8
-3/2y = 8 - 1/2 /*(-2/3)
y = 7 1/2 * (-2/3) = 15/2 * (-2/3) = -5
c)
12 - (-2b) = 88
2b = 88 - 12 /:2
b = 76/2 = 38
-4 * (c - 17) = -48
-4c + 68 = -48
-4c = -48 - 68 /:(-4)
c = 116/4 = 29
(-3)³ * z = 81
-27z = 81 /:(-27)
z = -3
Szczegółowe wyjaśnienie: