what is the value of 81^-3/4 ?
回答 (2)
2008-05-31 6:15 pm
✔ 最佳答案
(x^a)^b = x^(ab)x^(-a) = 1/x^a
81^(-3/4)
= (3^4)^(-3/4)
= 3^(-3)
= 1/27
2008-05-31 6:25 pm
81^-3/4
= 4â(1/81^3) (4â = extract the fourth root)
= 4â(1/531441)
= 1/27
= 4â(1/81^3) (4â = extract the fourth root)
= 4â(1/531441)
= 1/27
收錄日期: 2021-05-01 10:33:50
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