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^通常代表幾次方 比如 5^2 ------> 5²;5的平方就是5的2次方就是兩個5相乘 2^3 ------> 2³;2的立方就是2的3次方就是三個2相乘 3^4 ------> 3⁴;3的四次方就是四個3相乘 5^(1/2)------>√5------> 5的½;次方就是根號5 9^x ------> 9的x次方
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