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(a±b)2=a2±2ab+b2(a、b为数或式)是众所周知的两个完全平方公式,若通过公式的自身变形或两式相减,还可得到两个代数式的积化为这两个代数式的和差等式或和差不等式.如2ab=(a+b)2-(a2+
(a±b)2=a2±2ab+b2 (a and b are numbers or formulas) are two well-known full squares formulas. If the formula is self-deformed or subtracted, the two algebraic equations can be obtained. For these two algebraic sum and difference equations or sum inequality, such as 2ab=(a+b)2-(a2+