(x-y)的平方如何拆括号 x平方减去y的平方等于括号x-y括号乘以x+y括号怎么来的？
\uff08x+y\uff09\u7684\u5e73\u65b9\u628a\u62ec\u53f7\u62c6\u5f00\u600e\u9ebd\u5206\u89e3\u8fc7\u7a0b\uff1a(x+y)^2=(x+y)(x+y)=x*x+x*y+y*x+y*y=x^2+2xy+y^2
\u5176\u4e2d(x+y)^2=x^2+2xy+y^2\u662f\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u9700\u8981\u80cc\u4f4f\u7684\u3002
\u5e73\u65b9\u5dee\u516c\u5f0f\uff1a
a²-b²\uff1d(a+b)(a-b)
\u800cx²-y²\uff1d(x+y)(x-y)\u662f\u76f4\u63a5\u6839\u636e\u5e73\u65b9\u5dee\u516c\u5f0f\u5f97\u6765\u7684\u3002
\u5173\u4e8e\u5e73\u65b9\u5dee\u516c\u5f0f\u7684\u7531\u6765\uff1a
1.\u5e73\u65b9\u5dee\u516c\u5f0f\u662f\u5728\u591a\u9879\u5f0f\u4e58\u6cd5\u4e2d\u5b66\u5230\u7684\uff0c\u5c5e\u4e8e\u4e58\u6cd5\u516c\u5f0f\uff1b
2.\u591a\u9879\u5f0f\u4e58\u6cd5\u6cd5\u5219\u2014\u2014\u5c06\u5176\u4e2d\u4e00\u4e2a\u591a\u9879\u5f0f\u7684\u5404\u9879\u5206\u522b\u4e0e\u53e6\u4e00\u4e2a\u591a\u9879\u5f0f\u7684\u5404\u9879\u76f8\u4e58,\u7136\u540e\u628a\u6240\u5f97\u7684\u79ef\u76f8\u52a0\uff01
(a+b)(a-b)
\uff1da²-ab+ab-b²
\uff1da²-b²
\u5f53\u7136\u5e73\u65b9\u5dee\u516c\u5f0f\u8fd8\u53ef\u4ee5\u7528\u51e0\u4f55\u56fe\u5f62\u6c42\u9762\u79ef\u7684\u65b9\u6cd5\u63a8\u5bfc\u51fa\u6765\u4e14\u66f4\u76f4\u89c2\u66f4\u597d\u7406\u89e3\uff01
~回答完毕~
~结果仅供参考~
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（x-y）²=x²-2xy-y²
请采纳
x^2-2xy+y^2
x-2xy+y
x^2-2xy+y^2
绛旓細锛坸-y锛²=x²-2xy+y²~鍥炵瓟瀹屾瘯~~缁撴灉浠呬緵鍙傝儈~\(^o^)/~绁濆涔犺繘姝~~
绛旓細锛坸-y锛塣2=x^2-2xy+y^2 杩欐槸瀹屽叏骞虫柟宸叕寮忥紝璁颁綇灏辫浜嗭紝濡傛灉闈炶姝ラ鐨勮瘽锛岄偅灏辨槸涓や釜鎷彿涓殑鍗曢」寮忎袱涓ょ浉涔橈紝鍗 锛坸-y锛塣2=锛坸-y锛夛紙x-y锛=x*x-x*y-y*x+y*y=x^2-2xy+y^2
绛旓細=x²-2xy+y²
绛旓細x鐨勫钩鏂+2xy+y鐨勫钩鏂锛泋鐨勫钩鏂-2xy +y鐨勫钩鏂
绛旓細浣犲ソ鍝鐩存帴鍘绘嫭鍙凤紝涓猴細(x-y)(x-y)=x^2-xy-xy+y^2 =x^2-2xy+y^2
绛旓細(X+Y)^2=X^2+2XY+Y^2(X-Y)^2=X^2-2XY+Y^2
绛旓細鍥犲紡鍒嗚В锛锛坸-y)^2 =(x-y)(x-y)=x^2-xy-xy+y^2 =x^2-2xy+y^2 鍥犲紡鍒嗚В鍘熷垯璇存槑 1銆佸垎瑙ｅ洜寮忔槸澶氶」寮忕殑鎭掔瓑鍙樺舰锛岃姹傜瓑寮忓乏杈瑰繀椤绘槸澶氶」寮忋2銆佸垎瑙ｅ洜寮忕殑缁撴灉蹇呴』鏄互涔樼Н鐨勫舰寮忚〃绀恒3銆佹瘡涓洜寮忓繀椤绘槸鏁村紡锛屼笖姣忎釜鍥犲紡鐨勬鏁伴兘蹇呴』浣庝簬鍘熸潵澶氶」寮忕殑娆℃暟銆4銆佺粨鏋滄渶鍚庡彧鐣欎笅灏鎷彿锛...
绛旓細x-y鎷彿鐨勫钩鏂鏄痻^2+y^2-2xy銆傝绠楄繃绋嬶細锛坸-y锛塣2 =锛坸-y锛夛紙x-y锛=x^2-xy-xy+y^2 =x^2+y^2-2xy 姹備竴涓暟鐨勪簩娆℃柟涔熷彨鍋氭眰杩欎釜鏁扮殑骞虫柟锛屽钩鏂规槸涓绉嶈繍绠楋紝姣斿锛宎鐨勫钩鏂硅〃绀篴脳a锛岀畝鍐欐垚a锛屼篃鍙啓鎴恆脳a(a鐨勪竴娆℃柟涔榓鐨勪竴娆℃柟绛変簬a鐨2娆℃柟锛夛紝渚嬪4脳4=16锛8脳8=64...
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