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比较法是一个中学数学中应用广泛、无处不有、无时不在的重要解题方法.判断两个实数a与b的大小,常常归结为判断它们的差a-b的符号.因此,如果设a-b=m,而m可表示为某些实数运算的结果,那么确定m的符号,必然要归结到实数运算的符号法则.只有在对m适当地变形(配方、分解因式等)之后,最后的结论
Comparative law is a widely used in middle school mathematics, ubiquitous, all the time important problem-solving method to determine the size of two real numbers a and b, often boiled down to determine the difference between their ab symbol, so if ab = m, and m can be expressed as the result of some real operations, then determining the sign of m necessarily comes down to the sign rule of real operations. Only after the proper deformation of m (formulation, decomposition factor, etc.) in conclusion