This text will talk about some new methods about the limit of disjunction function in the boundary and the operation of lead number and definite integral.
分段函数是函数问题中难点，本文就分段函数在分界点的极限，导数、定积分的运算问题探讨一些新方法。
A logic element that performs the Boolean operation of disjunction.
布尔量或逻辑变量可占用一个字。
A logic element that performs the Boolean operation of disjunction.
布尔量或逻辑变量可占用一个字。
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