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估值是指在解题过程中,有意识地对需要考查的数或式的取值情况作一估 计.应用此方法能使一些问题迅速找到解题途径.但要注意的是.估计数值要适 度,不能太大,也不宜太小.请看:
Valuation refers to consciously estimating the value of the number or formula that needs to be examined during the process of solving a problem. Applying this method can make some problems quickly find a solution to the problem. However, it should be noted that the estimated value should be appropriate. It can’t be too big or too small. See: