Jawabanmu

2014-08-06T15:19:09+07:00
A² + 1/2² = 66
1/4 a² = 66
a² = 16.5
a= 4,06

a - 1/a
= 4,06 - 1/4,06
= 16,5/4.06 - 1/4,06
= 15,5/4,06
= 3,83