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从小学时的加减乘除，到中学时的因式分解，再到大学时的目标函数和微积分，数学概念升级了，自己的年龄也增长了，对人生的理解也渐渐复杂起来。人生的常数和变数尽管难以运算和把握，不过，一般的人生路数，运用加减乘除四则混合运算也就迎刃而解了。
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