Answers

2014-10-14T21:43:28+08:00
Suppose you have the expression as:
 \frac{x^2}{x^2}
isn't it that the law of exponent states that 
 \frac{a^n}{a^m} =a ^{m-n}
then that makes the expression
 x^{2-2}  = x^0
isn't it that when you divide x² by x² directly you'll get 1?

now let's have this sequence
2³ = 8
2² = 4
2^1 = 2
2^0 = 1
did you notice that when you subtract the exponent from cube to square(3-1), it's just 8/2=4? it's the same thing happened when you have exponents 1 and 0 from exponent 1 2^1 = 2 since you are to get the value for the number raised to zero then all you have to do is divide 2 by 2 = 1
2 3 2
2014-10-16T18:23:08+08:00
Because..zero is only one.
1 5 1