Question

(1/3)^(-2)+(3/5)-1/6+√81

Answer 1

1/3-² + 3/5 - 1/6 +9
3² + 3/5 -1/6 + 9
9 + 3/5 - 1/6 +9
18 + 3/5 -1/6 = 
mmc de 5 e 6 = 30
30. 18 = 540
6.3 = 18              540/30 + 18/30 + 5/30 = 563/30 = 18,7666       ok
5.1 = 5