The first question. The even power of (-1) is always (+1). The zeroth power of nonzero real numbers is always 1. The third term: the so-called negative power is to reverse the numerator and denominator, which is 2.

The second question. The root number (1/3) is the root number 3; The root number 9 equals 3; The root number 27 is equal to three times the root number 3. Finally, similar items are merged.

The third question. Using the square difference formula, it is 5-7+2=-2+2=0.

The fourth question. Square both sides of the equation at the same time, and then remove the denominator 3 to get 2x = 5 * 3 and x = 15/2.

The fifth question. The root number 2 is equal to twice, minus 1, and finally add the root number 2. Do it yourself, okay?