Let a = 1, B = 2, then the expression! A

The result is 1
! has higher priority than

The general formula of 1,2,1,2

an=1.5-0.5*(-1)^n

The process of proving that the derivative of logarithm of X is 1 / (xlna)

Logax = logex / logea = LNX / LNA the derivative of LNX is 1 / x, then (logax) = (LNX) / (LNA = 1 / (xlna)

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