x的平方加y的平方应该用什么公式进行计算或者分解？ （x+y）的平方分解成一个什么公式
x\u7684\u5e73\u65b9 y\u7684\u5e73\u65b9\u600e\u4e48\u505a\u554a\u80fd\u5426\u7528\u5e73\u65b9\u5dee\u516c\u5f0f\u5206\u89e3\u56e0\u5f0fx\u7684\u5e73\u65b9 y\u7684\u5e73\u65b9\u600e\u4e48\u505a\u554a\u80fd\u5426\u7528\u5e73\u65b9\u5dee\u516c\u5f0f\u5206\u89e3\u56e0\u5f0f
\u89e3\uff1a
\u4e2d\u95f4\u7684\u7b26\u53f7\u662f\u4ec0\u4e48\uff1f
\u5982\u679c\u662f+\u53f7\uff0c\u90a3\u4e48x²+y²\u4e0d\u80fd\u5206\u89e3
\u5982\u679c\u4e2d\u95f4\u662f-\u53f7\uff0c\u90a3\u4e48\u53ef\u4ee5\u5206\u89e3
x²-y²=(x+y)(x-y)
x\u7684\u5e73\u65b9+2xy+y\u7684\u5e73\u65b9\uff08\u5b8c\u5168\u5e73\u65b9\u548c\u516c\u5f0f\uff09
x^2+y^2=(x+y)^2-2ab
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绛旓細鍥炵瓟锛x^2+y^2=(x+y)^2-2ab
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