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规律是客观存在的,是不以人们的意志为转移的.但是,人们能够认识它,利用它.近年来中考题中,有一些问题的解答,需要我们从探索规律入手.例1已知,a1=11×2×3+12=23,a2=12×3×4+13=38,a3=13×4×5+14=415…依据上述规律,则a99=____.解析:不难发现,a1、a2、a3的求值式子都是分子为1的两个分数的和.其中第一个分数的分母是三个连续正整数的连乘积,第二个分数的
Law is an objective reality, is not to people’s will for the shift, but people can recognize it and use it.In recent exam questions, there are some questions that we need to explore the law to start.Example 1 Known, a1 = 11 × 2 × 3 + 12 = 23, a2 = 12 × 3 × 4 + 13 = 38, a3 = 13 × 4 × 5 + 14 = 415 ... According to the above rules, then a99 = ____. , a1, a2, a3 evaluation formula is the sum of two fractions of the numerator 1. The denominator of the first fraction is the product of the product of three consecutive positive integers, the second fraction