A * b = 1/a + 1/b. A+b = 9, a × b = 20, a * b = ? 

A+b = 9, a × b = 20, a = 4, b = 5, 1/4 + 1/5 = 9/20
* operatsioonat ilisarnissaq a * b = 1/a + 1/b, aammalu ullorsiutissat a, b. A * b Pikisaqarpoq, a + b = 9, a × b = 20.

A * b ilisarnissaq, a + b = 9, ab = 20, (a + b)/ab. 
A * b = (a + b)/ab = 9/(a * b) = 9/20.

A * b Pikisaqarpoq 9/20.