(x+a)^n=∑_(k=0)^n▒〖(n¦k) x^k a^(n−k) 〗
a2+b2=c2
(1+x)^n=1+nx/1!+(n(n−1) x^2)/2!+⋯
e x=1+x/1!+x^2/2!+x^3/3!+⋯,−∞<x<∞
f(x)=a_0+∑_(n=1)^∞▒(a_n cos 〖nπx/L〗+b_n sin 〖nπx/L〗 )
A＝X＋Y＋Z
~ ~ ~ ~ ~ ~
错题记录册
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具体操作说明：
1. 在表1中记录下下次预计复习/重做的时间，重做后记下正确与错误的情况。

2. 复习间隔周期因人而异。

一般建议，做错后，隔15天再做一次；做对后，1-2个月再做一次。

再对，则可考虑不做了。

附：高中数学讲义：
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