（x+y+z）的平方的什么，详细过程，急急急！！
\u6c42\uff08x-y+z\uff09\u7684\u5e73\u65b9\u7684\u503c \uff08\u8981\u6709\u8fc7\u7a0b\uff0c\u8c22\u8c22\uff01\uff09\uff08x-y+z\uff09\u7684\u5e73\u65b9
=(x-y)²+2(x-y)z+z²
=x²-2xy+y²+2xz-2yz+z²
\u4f60\u597d\uff0c\u6ca1\u6709\u9633\u5149\u7684\u52a8\u4eba\uff1a
\u89e3\uff1a
\u22353(x²+y²+z²)=(x+y+z)²
\u53733x²+3y²+3z²=x²+y²+z²+2xy+2yz+2xz
2x²+2y²+2z²=2xy+2yz+2xz
2x²+2y²+2z²-2xy-2yz-2xz=0
(x²+y²-2xy)+(y²+z²-2yz)+(x²+z²-2xz)=0
(x-y)²+(y-z)²+(x-z)²=0
\u4e14(x-y)²\u22650\uff0c(y-z)²\u22650\uff0c(x-z)²\u22650
\u2234x-y=0\uff0cy-z=0\uff0cx-z=0
\u89e3\u5f97x=y=z
\u2234x\u3001y\u3001z\u7684\u5173\u7cfb\u662f\u76f8\u7b49\u7684
=(x+y+z)(x+y+z)
=x²+xy+xz+yx+y²+yz+zx+zy+z²
=x²+y²+z²+2(xy+yz+zx)
绛旓細瑙ｏ細锛坸+y+z锛²=锛坸+y+z锛夛紙x+y+z锛=x²+xy+xz+xy+y²+yz+xz+yz+z²=x²+y²+z²+2xy+2xz+2yz 锛坸鍔爕鍔z锛夌殑骞虫柟=x²+y²+z²+2xy+2xz+2yz
绛旓細(3,4,5)(5,12,13)(7,24,25)(6,8,10)(8,15,17)(10,24,26)(12,35,37锛(8,15,17)(12,35,37)(16,63,65)
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绛旓細鍑犳鍑犻」寮 娆¤〃绀虹浉涔樼殑,濡倄鏄竴娆,xy銆亁鐨勫钩鏂閮芥槸涓ゆ,xyz銆亁鐨勭珛鏂规槸涓夋,浠ユ绫绘帹鈥︹︹滈」鈥濊〃绀虹浉鍔犵殑,濡倄鏄竴椤,x+y銆亁+xy銆亁+x^2閮芥槸浜岄」,x+y+z銆亁y+xyz+x^3閮芥槸涓夐」,浠ユ绫绘帹鈥︹(x^3琛ㄧずx鐨勭珛鏂,x^2琛ㄧずx鐨勬柟锛夆滃厓鈥濊〃绀烘湭鐭ユ暟鐨勪釜鏁般傚x銆亂閮芥槸涓鍏,x+y銆...
绛旓細鎵浠ワ細X鐨勫钩鏂+Y鐨勫钩鏂+Z鐨勫钩鏂-XY-YZ-ZX =3x^2-3x^2 =0 A鐨勫钩鏂+B鐨勫钩鏂+C鐨勫钩鏂-2(A+B+C)+3=0,姹 A鐨勭珛鏂+B鐨勭珛鏂+C鐨勭珛鏂-3ABC A鐨勫钩鏂+B鐨勫钩鏂+C鐨勫钩鏂-2(A+B+C)+3 =(A^2-2A+1)+(B^2-2B+1)+(C^2-2C+1)=(A-1)^2+(B-1)^2+(C-1)^2 =0-->A=...
绛旓細濡傛灉浣犵殑鎰忔濇槸 (x+y-z)鐨勫钩鏂 閭ｄ箞灞曞紑灏卞緱鍒皒^2+y^2+z^2+2xy-2xz-2yz 鑰屽鏋滄槸(xy-z)鐨勫钩鏂 寰楀埌x^2 y^2 +z^2 -2xyz
