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把一个数N写成a×10n(1≤a<10,n为整数)的形式的记数方法叫做科学记数法。科学记数法是表示大数字或小数字的一种简单的方法,也是中考命题的热点之一。现以部分中考题中运用科学记数法的社会热点问题为例进行说明。1.保护耕地与科学记数法。例1保护耕地、惠及子孙,国家将亿亩耕地定为“红色警示线”。2005年底,国家公布我国实有耕地面积为18.35
The method of counting a number N in the form of a × 10n (1 ≤ a < 10, n is an integer) is called scientific notation. Scientific notation is a simple method of expressing large numbers or small numbers, and it is also one of the hot spots in the examination topic. Now we will take the social hot issues of the scientific notation in some examination questions as an example. 1. Protect farmland and scientific notation. Case 1 protects the cultivated land and benefits the children and grandchildren. The state will set a million mu of cultivated land as a “red warning line.” At the end of 2005, the country announced that China’s actual cultivated area is 18.35