Web Reference: 神经可塑性研究显示，30岁大脑仍保留85%的学习适应能力，而决策失误率却比20岁降低40%。 或许，30岁最恰当的定义是：带着方法论的天真，怀着审慎的勇气，走向真正自主的人生阶段。 但30岁、40岁都并不晚，现在的你决定了以后四五十年的人生。 与其坐以待毙，不如走出舒适圈，提升学历、提升能力。 一份985/211名校研究生学历带给你的机会和资源，远比你想象得多。 sin 30°＝cos60°＝½ sin60°＝cos30°＝√3／2 sin45°＝cos45°＝√2／2 tan 45°＝1 tan30°＝√3／3 tan60°＝√3 其实sin30，45，90和cos30,45,60数值的顺序是相反的，3倍tan30°＝tan60° tan45°的图形就是一个 等腰直角三角形 两腰旳比，两腰相等，比为1 发布于 2017-02-26 20:34 查看剩余 ...
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