Why is the zero power of all rational numbers except zero one?

Why is the zero power of all rational numbers except zero one?

For example, if any number a (a is not equal to 0), then the nth power of a is divided by the nth power of a. According to the division rule of exponential operation (the base number is the same, and the exponent is subtracted), then it is equal to the (n-n) power of a, i.e. the 0th power of a, and according to the principle that any number is divided by itself is equal to 1 except for 0, then the nth power of a is divided by the nth power of a, so the 0th power of a is equal to 1

For example, any number a (a is not equal to 0), the nth power of a divided by the nth power of a, according to the exponential division rule (the same base number, exponential minus), is equal to the (n-n) power of a, that is, the 0th power of a, and according to the principle that any number except 0 is divided by itself is equal to 1, the nth power of a divided by the nth power of a is equal to 1, so the 0th power of a is equal to 1

For example, if any number a (a is not equal to 0), then the nth power of a is divided by the nth power of a. According to the division rule of exponential operation (the base number is the same, and the exponent is subtracted), then it is equal to the (n-n) power of a, that is, the 0th power of a. According to the principle that any number is divided by itself by 1 except for 0, the nth power of a is divided by the nth power of a, so the 0th power of a is equal to 1

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