$a^{x+y}$ $a^{x-y}$ $a^x \times a^y$ $\frac{a^x}{a^y}$ ${(a^b)}^c$ $a^{bc}$ $a^x \times b^x$ $a^1$ $a^{-1}$ $a^{\frac{1}{n}}$ $a^0$ $log_aM+log_aN$ $log_aM-log_aN$ $log_aMN$ $log_a \frac{M}{N}$ $log_aa$ $log_aa^x$ $log_a1$ $log_a \frac{1}{a}$ $log_aM^s$ $log_{a^r}M$ $log_{a^r}M^s$ $slog_aM$ $\frac{1}{r}log_aM$ $\frac{s}{r}log_aM$ 換底公式 還原公式 連鎖公式 1. $a=0.4^{10}-0.4^{9},b=0.4^{11}-0.4^{10},c=\frac{0.4^{11}-0.4^{9}}{2}$ 2. $a=1.5^{10}-1.5^{9.9},b=1.5^{10.1}-1.5^{10},c=\frac{1.5^{10.1}-1.5^{9.9}}{2}$ 3. $a=\frac{4^{10}-4^5}{5},b=\frac{4^5-4^3}{2},b=\frac{4^{10}-4^3}{7}$
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