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b4
It can be.
Example: Let's say b-8.2, where b is an integer. First step, turn the negative exponent to a positive one, and then use the laws of exponents. b-8.2 = 1/b8.2 = 1/b8+1/5 = 1/[b8b1/5] = 1/b8 * 1/b1/5 = 1/b8 * {1(b4/5)/[(b1/5)(b4/5)]} = 1/b8 * b4/5/b(1/5)+(4/5) = 1/b8 * b4/5/b5/5 = 1/b8 * b4/5/b = b4/5/b8+1 = b4/5/b9
Use following function in any other cell to calculate sum: =sum(b4:b7)
B4 or B*B*B*B