1. If radical type is used, write with the simplest radical type first.

2. The zeroth power of any nonzero number is equal to 1, π≈3. 14, so π- 1≠0.

3. The negative exponential power of a number = the base becomes its reciprocal, and the exponent becomes its reciprocal.

4. If there is an absolute value, it is necessary to remove the absolute value. According to the positive and negative numbers in the absolute value, the root number 2 is approximately equal to 1.4 14, so1-the root number 2 is negative. If you remove the sign of absolute value, it will become its inverse.