Wielkość a wyznaczona ze wzoru c = ab/a+b, gdzie a ≠ -b, b≠c, b ≠ -c. b≠0 i c ≠ 0 jest równa...
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c = ab/a+b /*(a+b)
ca+cb=ab
cb=ab-ac
cb=a(b-c) /:(b-c)
cb/b-c=a