Question

Wyznacz wzór na b
1/a+1/b=1/c

Answer 1

1/a+1/b=1/c / /-1/a
1/b=1/c-1/a//*b
1=b(1/c-1/a)///(1/c-1/a)
b=1/1/c-1/a
b=a/ca-c/ca
b=ac/ca

Answer 2

1/b= 1 / c - 1 / a
1/b= a / ac - c / ac
1/b= (a - c) / ac 
b= ac / (a-c)