range:the difference between the greatest and the smallest measurement.so we can suppose a>b>c>d, thus a-d=24.5,when a and d repectively plus 6 and is divided by 10,the results are (a+6)/10 - (d+6)/10 =a-d/10, and 24.5 divided by 10 equals 2.45.
以下是引用zxlwwp在2009/8/31 14:10:00的发言： range:the difference between the greatest and the smallest measurement.so we can suppose a>b>c>d, thus a-d=24.5,when a and d repectively plus 6 and is divided by 10,the results are (a+6)/10 - (d+6)/10 =a-d/10, and 24.5 divided by 10 equals 2.45.
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发表于 2009-8-31 10:29:00
