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对于两位数平方的计算 ,自古以来都是列草式计算 ,或死背得数 ,没有一个确定的口算方法 ,更谈不上什么心算技巧了。一个偶然的机会 ,山西省实验小学的徐国亮发现了关于平方的计算方法 ,而且并非一种方法。经过四年多的潜心研究 ,他进一步发现了其中的内在规律 ,并且总结出五种方法。其共同特点就是不用笔算 ,用心算或口算就能得出正确结果 ,从而达到速算的目的。他的“两位数平方新的五种算法”在2000年全国第八届科技辅导员发明会上 ,被评为二等奖。现将其中几种简便的运算方法介绍如下 ,希望能够对大家有所帮助。
For the calculation of double-digit square, since ancient times are listed in the grass-type calculation, or die count, there is no specific method of calculating, let alone what mental arithmetic skills. By chance, Xu Guoliang of Shanxi Experimental Primary School discovered the calculation method of square, and not a method. After more than four years of painstaking research, he further discovered one of the internal laws, and summed up five methods. The common feature is that they do not have pen calculations, intentions or mouth calculations can get the correct results, so as to achieve the purpose of quick calculation. His “two-digit square new five algorithms” in 2000 the eighth science and technology counselors invention, was awarded the second prize. Here are several simple methods of operation are as follows, I hope to be helpful to everyone.