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d = b/a² - ab + 1 / * a² założenie a≠0
a²d = b - a³b + a²
a²d - a² = b(1 - a³)
a²(d - 1) = b(1 - a²)
b = [a²(d - 1)]/(1 - a²)
b)
w = (2s + 1)/s - 3 / * s założenie s ≠ 0
sw = (2s + 1) - 3s
sw = 2s + 1 - 3s
sw = - s + 1
sw + s = 1
s(w + 1) = 1
s = 1/(w + 1)
c)
t = 1/v + 1/(a + 1) *- a/2v / * 2v(a + 1) założenie v ≠ 0 i a + 1 ≠ 0 , a ≠ - 1
2vt(a + 1) = 2(a + 1) + 2v - 2v(a + 1)
2vt(a + 1) - 2v + 2v(a + 1) = 2(a + 1)
2v[t(a +1) - 1 + (a + 1)] = 2(a + 1)
2v[(a + 1)(t - 1 + 1)] = 2(a + 1)
2v[(a + 1)t] = 2(a + 1)
2v = 2(a + 1)/t(a +1) = 2/t
v = 2/t : 2 = 2/t * 1/2 = t
d)
a = c/(c + 1) + 2 / * (c + 1) założenie c + 1 ≠ 0 to c ≠ - 1
a(c + 1) = c + 2(c + 1)
ac + a = c + 2c + 2
ac + a = 3c + 2
ac - 3c = 2 - a
c(a - 3) = 2 - a
c = (a - 3)/(2 - a)