https://img62.imageshack.us/img62/522/mat26022012.jpg

A)5 B)7 C)9 D)11 E)12

√9=3 ise, 9=3^(2) olur. yani √a=b iken, a=b^(2) olur.
5^(x/y)=7
7^(y/x)=5
7+5=12 bulunur.

https://chart.apis.google.com/chart?...D%7Bx%7D%20%7D=https://chart.apis.google.com/chart?...D%7Bx%7D%20%7D ise 5=https://chart.apis.google.com/chart?...D%7Bx%7D%20%7D


https://chart.apis.google.com/chart?...D%7By%7D%20%7D=https://chart.apis.google.com/chart?...D%7By%7D%20%7D ise 7=https://chart.apis.google.com/chart?...D%7By%7D%20%7D yani her iki tarafı x ve y ye böldüğümüzde yukarıdaki ifadeler elde edilir.

7+5=12 olur