Several power comparisons in mathematics need transformation methods.

Question 1: radix is 0.9 and powers are 3 and 2.7. For radix less than 1, the larger the exponent, the smaller the value, and vice versa, so the following 0.9(2.7) is larger.

Question 2: You need to compare with 1. First, compare 2.9(0.3) and 1(0.3). Of course, the former is bigger. Similarly, comparing 0.9(3) with 1(3), the latter is larger, and the answer to the second question is 2.9(0.3).

Junior three questions: it is equivalent to comparing 3(3) and 2(3) to deal with the amount of questions. Obviously, the former is bigger.