论文部分内容阅读
根据(a+b)~2-(a-b)~2=4ab,我们不难推出一个关于积化平方差的公式: ab=1/4[(a+b)~2-(a-b)~2],
According to (a+b)~2-(ab)~2=4ab, it is not difficult to formulate a formula for the squared product difference: ab=1/4[(a+b)~2-(ab)~2] ,