Question

Помогите очень надо
1/(1/91-1/42)=?

Answer 1

1/(1/91-1/42) = -78
...

Answer 2

не полный ответ

Answer 3

1/91 = 0.01098901098; 1/42 = 0.0238095238; 0.01098901098 - 0.0238095238 = (-0.01282051282); 1/(-0.01282051282) = -78.0000000031