Odpowiedź:
zad 3
S = (a + 2t)/3
3S = a + 2t
2t = 3S - a
t = (3S - a)/2
P = t - 3rt + 2
3rt = t - P + 2
r = (t - P + 2)/3t
F = (4y - z)/3
3F = 4y - z
z = 4y - 3F
Szczegółowe wyjaśnienie:
S= (a+2t)/3 *3
3S=a+2t
3S-a=2t * :2
t= (3S-a)/2
P=t - 3rt + 2
P= t(1-3r)+2
P-2=t(1-3r) :t
(P-2)/t = 1-3r
(P-2)/t -1 = -3r :(-3)
(P-2)/(-3t) + 1/3 = r
F= (4y-z)/3 *3
3F= 4y-z
z=4y-3f
