(x-y)的平方=(y-x)的平方吗
x\u7684\u5e73\u65b9=yx\u53ef\u53d6\u4efb\u4f55\u6570\uff0c\u5982\u679c\u6709\u9650\u5236\uff0c\u5e94\u8be5\u662f\u9898\u76ee\u4e2d\u8fd8\u6709\u53e6\u5916\u7684\u8981\u7d20\uff0c\u4e0d\u53ef\u80fd\u5c31\u8fd9\u6837\u89c4\u5b9ax\u5927\u4e8e\u96f6
9(x+y)²-(x-y)²
=[3(x+y)+(x-y)][3(x+y)-(x-y)]
=(3x+3y+x-y)(3x+3y-x+y)
=(4x+2y)(2x+4y)
=4(2x+y)(x+2y)
这是对的
等于x2-2xy+y2=y2-2xy+x2我真的好无聊，来帮初中生。还是个学渣初中生
绛旓細锛坸-y)鐨勫钩鏂=锛坸-y)(x-y)=x骞虫柟-xy-xy+y骞虫柟=x骞虫柟-2xy+y骞虫柟 杩欐槸瀹屽叏骞虫柟鍏紡锛岋紙x+y锛夌殑骞虫柟鍙鍦2xy鍓嶉潰鏀规垚+灏辫浜
绛旓細鍘熷紡 =-(x-y)²(x-y)³(x-y)⁴=-(x-y)^(2+3+4)=-(x-y)^9
绛旓細鍚屽鎮ㄥソ锛屽鏋滈棶棰樺凡瑙ｅ喅锛岃寰楀彸涓婅閲囩撼鍝~~鎮ㄧ殑閲囩撼鏄鎴戠殑鑲畾~璋㈣阿鍝
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...
绛旓細(x涓y)鐨勫钩鏂=x鐨勫钩鏂-2xy+y鐨勫钩鏂
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y-x鐨勫洓娆℃柟鍙啓涓簓-x鐨勪簩娆℃柟鐨勫钩鏂癸紝鍚岀悊x-y涔熷彲浠ヨ繖涔堝寲銆傚彧瑕佽瘉鏄锛坹-x)鐨勫钩鏂=锛x-y)鐨勫钩鏂瑰嵆鍙傦紙y-x)鐨勫钩鏂=y鐨勫钩鏂瑰姞x鐨勫钩鏂-2xy (x-y)鐨勫钩鏂=y鐨勫钩鏂瑰姞x鐨勫钩鏂-2xy 鎵浠(y-x)鐨4娆℃柟绛変簬(x-y)鐨4娆℃柟
绛旓細x^2(x-y)+y^2(y-x)=x^2(x-y)-y^2(x-y)=(x^2-y^2)(x-y)=(x-y)(x+y)(x-y)=(x+y)(x-y)^2
绛旓細x鐨勫钩鏂癸紙x-y锛+y鐨勫钩鏂癸紙y-x锛= x^2(x-y)-y^2(x-y)=(x-y)(x^2-y^2)=(x-y)^2(x+y)锛坸-y锛夌殑绔嬫柟+4锛坹-x锛=(x-y)^3-4(x-y)=(x-y)[(x-y)^2-4]=(x-y)(x-y+2)(x-y-2)
绛旓細濡傚浘鎵绀
