早晨太阳必然从东方升起;边长为a、b的矩形,其面积必为ab……这些在发生前人们就可以准确断定出其确定结果的事件,可称为确定性现象。与之相反,生活中还存在着另一些事件。如:随手掷出一枚硬币,它会正面朝上,还是会反面朝上?在结果出现前,我们无法预先 In the morning, the sun must rise from the east; the rectangles whose sides are a and b must have an area of ​​ab. These events, before the occurrence of which people can accurately determine their results, can be called deterministic phenomena. In contrast, there are other events in life. For example, if a coin is thrown, will it be face up or face it up? Before the result, we cannot advance