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因式分解 ,不仅是初中数学中一个重要的基础知识 ,它还是一种重要的数学思想方法 ,应用很广 .一、用于求值或计算例 1 计算下列各题 :(1) 1 2 345 2 + 0 76 5 5 2 + 2 4 6 9× 0 76 6 5 .(1991年“希望杯”数学竞赛试题 )(2 ) 1995 3- 2× 1995 2 - 19931995 3+ 1995 2 - 1
Factorization is not only an important basic knowledge in junior high school mathematics, it is also an important method of mathematics and it is widely used. First, it is used for evaluation or calculation Example 1 Calculate the following questions: (1) 1 2 345 2 + 0 76 5 5 2 + 2 4 6 9× 0 76 6 5. (1991 “Hope Cup” Mathematics Contest Questions) (2) 1995 3- 2× 1995 2 - 19931995 3+ 1995 2 - 1