高考阅卷执行“关键步骤赋分”规则，对于函数性质类问题，关键步骤（如定义转化、性质应用）占60%分值，因此准确把握内涵对得分至关重要。通过准确把握概念的内涵与外延，考生能够将陌生问题转化为熟悉领域，提高解题效率和高考成绩。

T-accounting is a method used by accountants and bookkeepers that gets its name from the T shape formed by the two columns used to record entries. Also called double-entry accounting, T-accounting ...

When the Clay Mathematics Institute put individual $1-million prize bounties on seven unsolved mathematical problems, they may have undervalued one entry—by a lot. If mathematicians were to resolve, ...

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