1條數學的題目

2^(6 - z) = 4^(6 + z)

2^(6 - z) = 2^2(6 + z)

2^(6 - z) = 2^(12 + 2z)

6 - z = 12 + 2z

3z = -6

z = -2

驗算:

2^(6 + 2) = 2^8

4^(6 - 2) = 4^4 = 2^2^4 = 2^8

2^6-z=4^6+z
2^6-z=2^12+2z
so............................
6-z=12+2z
-3z=12-6
-3z=-6
z=-2

圖片參考：http://img213.imageshack.us/img213/2662/90725328.png

I hope can help you