急!乘法公式变形:a²+b²=________=_________=_________ 2ab=________=_________=_________
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急!乘法公式变形:a²+b²=________=_________=_________ 2ab=________=_________=_________
急!乘法公式变形:a²+b²=________=_________=_________ 2ab=________=_________=_________
急!乘法公式变形:a²+b²=________=_________=_________ 2ab=________=_________=_________
(a+b)的平方-2ab (a-b)的平方+2ab
(a+b)的平方-a平方-b平方 (a-b)的平方-a平方-b平方
都是只做出来2个.