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--- cert_exam:tech_radio_op_1:b:formula:start [2019/12/17 20:49] – [近似公式] fu
+++ cert_exam:tech_radio_op_1:b:formula:start [2019/12/31 22:46] (current) – [高校数学] fu
@@ Line 23: / Line 23: @@
 二項定理
 \[
-( 1 + x )^a = 1 + \frac{a}{x} + \frac{a ( a - 1) }{2!} x + ...
+( 1 + x )^a = 1 + a x + \frac{a ( a - 1) }{2!} x + ...
 \]
@@ Line 43: / Line 43: @@
+===== 高校数学 =====
+=== 対数log ===
+\[
+log_a M N = log_a M + log_a N \\
+log_a \frac{M}{N} = log_a M - log_a N \\
+log_a b = \frac{log_c b}{log_c a} \\
+log_a M^r = r  log_a M
+\]