x与y的差的平方的相反数不是正数,的解是什么？ x与y的平方差是什么
\u6570\u5b66\u5c0f\u95ee\u98981\uff09-2x3-2x(-1)-(-2)x4=-2x(3+1-4)=0
\u89e3\uff1a-2x3-2x(-1)-(-2)x4\u22600\uff0c\u800c=-2x(3+1-4)=0\u8fd9\u662f\u6b63\u786e\u7684\uff0c\u8fd9\u6837\u770b\u6765\u53ef\u4ee5\u77e5\u9053\uff1a-2x3-2x(-1)-(-2)x4\u2260=-2x(3+1-4\uff09\u6240\u4ee5\u4e0d\u5bf9\u3002
2.\u56e0\u4e3a(x+y-1)\u7684\u5e73\u65b9\u22650\uff0c2x-y+4\u7684\u7edd\u5bf9\u503c\u22650\uff0c\u4e14(x+y-1)\u7684\u5e73\u65b9=-2x-y+4\u7684\u7edd\u5bf9\u503c
\u6240\u4ee5(x+y-1)\u7684\u5e73\u65b9=0\uff0c2x-y+4\u7684\u7edd\u5bf9\u503c=0
\u6240\u4ee5x+y-1=0.2x-y+4=0
\u89e3\u5f97x=-1\uff0cy=2
3\uff09\u7edd\u5bf9\u503c\u4e0e\u76f8\u53cd\u6570\u6211\u8bb0\u5fc6\u4e2d\u597d\u50cf\u6ca1\u6709\u4ec0\u4e48\u76f8\u540c\u7684\uff0c\u66f4\u52a0\u522b\u8bf4\u5dee\u522b\u7684\uff0c\u8fd9\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u8868\u793a\uff0c\u5728\u51fa\u9898\u4e0a\u4e5f\u662f\u5343\u53d8\u4e07\u5316\u7684\u3002
4\uff09\u65e0\u8bba\u662f\u4ec0\u4e48\u65f6\u5019\uff0c\u53ea\u6709\u6709\u6b21\u65b9\u7684\u90fd\u53ef\u4ee5\u8bfb\u6b21\u5e42\u3002
5\uff09\u662f\u5bf9\u7684\uff0c\u4f46\u662f\u8fd91/3\u8fd9\u4e2a\u5316\u6210\u5c0f\u6570\u5c31\u6ca1\u6709\u5199\u51fa\u6765\u7684\u610f\u4e49\u4e86\u3002
\u5c31\u662fX\u7684\u5e73\u65b9\u51cf\u53bbY\u7684\u5e73\u65b9\uff0c\u4e5f\u5c31\u7b49\u4e8e\uff08x+y\uff09\uff08x-y\uff09
就是说-(x-y)²<0,(x-y)²>0,得x>y或y>x，即x≠yx=y,则有x-y=0,-(x-y)²=0，0不是整数
绛旓細灏辨槸璇-(x-y)²<0,(x-y)²>0,寰梮>y鎴杫>x锛屽嵆x鈮爕
绛旓細y鐨勫钩鏂瑰嵆y2鍒檟涓巠鐨勫钩鏂圭殑宸氨鍙互琛ㄧず銆佽В绛斻佽В锛歽鐨勫钩鏂瑰嵆y2鍒檟涓巠鐨勫钩鏂圭殑宸氨鏄痻-y2銆佹晠绛旀鏄痻-y2銆傚钩鏂瑰樊鍏紡锛坒ormula for the difference of square锛夋槸鎸囦袱涓暟鐨勫拰涓庤繖涓や釜鏁板樊鐨勭Н锛岀瓑浜庤繖涓や釜鏁扮殑骞虫柟宸佸叕寮忎腑瀛楁瘝鐨勪笉浠呭彲浠ｈ〃鍏蜂綋鐨勬暟瀛椼佸瓧姣嶃佸崟椤瑰紡鎴栧椤瑰紡绛変唬鏁板紡銆...
绛旓細(1)|5X锛60|>=0,(Y锛3)鐨勭畻鏈骞虫柟鏍>=0,浜岃呬簰涓鐩稿弽鏁,鍙兘鍚屾椂绛変簬0 鍒X=12,Y=3 X锛Y鐨勫樊鐨绠楁湳骞虫柟鏍=鏍瑰彿(12-3)=3 (2)1/(1锛2鐨勭畻鏈钩鏂规牴)=鏍瑰彿2锛1 1/(2鐨勭畻鏈钩鏂规牴锛3鐨勭畻鏈钩鏂规牴)=鏍瑰彿3-鏍瑰彿2 1/(3鐨勭畻鏈钩鏂规牴锛4鐨勭畻鏈钩鏂规牴)=鏍瑰彿4-鏍瑰彿3 ...1/(2004...
绛旓細x-y鎷彿鐨勫钩鏂规槸x²+y²-2xy锛涙暟a鐨刵锛坣涓鸿嚜鐒舵暟锛夋鏂规牴鎸囩殑鏄痭鏂瑰箓绛変簬a鐨勬暟锛屼篃灏辨槸閫傚悎b鐨刵娆℃柟=a鐨勬暟b銆備緥濡16鐨4娆℃柟鏍规湁2鍜-2銆備竴涓暟鐨2娆℃柟鏍圭О涓哄钩鏂规牴锛3娆℃柟鏍圭О涓虹珛鏂规牴銆傚悇娆℃柟鏍圭粺绉颁负鏂规牴銆傛眰涓涓寚瀹氱殑鏁扮殑鏂规牴鐨勮繍绠楃О涓哄紑鏂广備竴涓暟鏈夊灏戜釜鏂规牴锛岃繖涓...
绛旓細鑻,y琛ㄧず涓や釜鏈夌悊鏁帮紝鍒欏畠浠殑鍜屾槸_x+y___锛屽畠浠殑鍊掓暟鍜屾槸1/x+1/y__锛屽畠浠殑鍜岀殑鍊掓暟鏄1/(x+Y)__锛X涓嶻鐨勫樊鐨勭浉鍙嶆暟鏄_-(x-Y)__ X涓嶻鐨勫晢鏄痏_x/y___銆
绛旓細锛1锛夆埖x鐨勫钩鏂圭殑5鍊嶆槸5x2锛屸埓姣攛鐨勫钩鏂圭殑5鍊嶅皯2鐨勬暟鏄5x2-2锛涳紙2锛夆埖x鐨勭浉鍙嶆暟鏄-x锛寉鐨勫掓暟涓1y锛屸埓x鐨勭浉鍙嶆暟涓巠鐨鍊掓暟鐨勫拰鏄-x+1y锛涳紙3锛夆埖x涓巠涓ゆ暟鐨勫樊鏄痻-y锛屸埓x涓巠涓ゆ暟鐨勫樊鐨勫钩鏂规槸锛坸-y锛2锛涳紙4锛夆埖涓綅鏁板瓧涓篴锛屽崄浣嶆暟瀛椾负b锛岀櫨浣嶆暟瀛椾负c锛屸埓杩欎釜涓変綅鏁版槸100c+...
绛旓細Y: 73, 70, 75,72,70 E(Y )=72銆 骞冲潎鎴愮哗鐩稿悓,浣X 涓嶇ǔ瀹,瀵瑰钩鍧囧肩殑鍋忕澶с 鏂瑰樊鎻忚堪闅忔満鍙橀噺瀵逛簬鏁板鏈熸湜鐨勫亸绂荤▼搴︺ 鍗曚釜鍋忕鏄 娑堥櫎绗﹀彿褰卞搷 鏂瑰樊鍗冲亸绂骞虫柟鐨鍧囧,璁颁负D(X ): 鐩存帴璁＄畻鍏紡鍒嗙鏁ｅ瀷鍜岃繛缁瀷,鍏蜂綋涓: 杩欓噷 鏄竴涓暟銆傛帹瀵煎彟涓绉嶈绠楀叕寮 寰楀埌:鈥滄柟宸瓑浜庡钩鏂圭殑鍧囧煎噺鍘诲潎鍊肩殑...
绛旓細鍒嗘垚涓ゅ簳宸钩鏂,鏂规鍊嶇Н瑕佷负璐熴 涓よ竟涓鸿礋涓棿姝,搴宸钩鏂圭浉鍙嶆暟銆 涓骞虫柟鍙堜竴骞虫柟,搴曠Н2鍊嶅湪涓矾銆 涓夋涓ゅ簳鍜屽钩鏂,鍏ㄨ礋鍜屾柟鐩稿弽鏁般 鍒嗘垚涓ゅ簳宸钩鏂,涓ょ涓烘鍊嶇Н璐熴 涓よ竟鑻ヨ礋涓棿姝,搴曞樊骞虫柟鐩稿弽鏁般 鐢ㄥ叕寮忔硶瑙ｄ竴鍏冧簩娆℃柟绋 瑕佺敤鍏紡瑙ｆ柟绋,棣栧厛鍖栨垚涓鑸紡銆 璋冩暣绯绘暟闅忓叾鍚,浣垮叾鎴愪负鏈绠姣斻
绛旓細锛堜簩锛骞虫柟宸鍏紡1锛庡钩鏂瑰樊鍏紡锛1锛夊紡瀛愶細 a2-b2=(a+b)(a-b)锛2锛夎瑷锛氫袱涓暟鐨勫钩鏂宸紝绛変簬杩欎袱涓暟鐨勫拰涓庤繖涓や釜鏁鐨勫樊鐨绉傝繖涓叕寮忓氨鏄钩鏂瑰樊鍏紡銆傦紙涓夛級鍥犲紡鍒嗚В1锛庡洜寮忓垎瑙ｆ椂锛屽悇椤瑰鏋滄湁鍏洜寮忓簲鍏堟彁鍏洜寮忥紝鍐嶈繘涓姝ュ垎瑙ｃ2锛庡洜寮忓垎瑙ｏ紝蹇呴』杩涜鍒版瘡涓涓椤瑰紡鍥犲紡涓嶈兘鍐嶅垎瑙...
绛旓細璞￠檺瑙掔殑骞冲垎绾:璞￠檺瑙掔殑骞冲垎绾,鍧愭爣鐗瑰緛鏈夌壒鐐,涓銆佷笁妯旱閮界浉绛,浜屻佸洓妯旱纭浉鍙嶃 骞宠鏌愯酱鐨勭洿绾:骞宠鏌愯酱鐨勭洿绾,鐐圭殑鍧愭爣鏈夎绌,鐩寸嚎骞宠X杞,绾靛潗鏍囩浉绛夋í涓嶅悓;鐩寸嚎骞宠浜Y杞,鐐圭殑妯潗鏍囦粛鐓ф棫銆 瀵圭О鐐瑰潗鏍:瀵圭О鐐瑰潗鏍囪璁扮墷,鐩稿弽鏁浣嶇疆鑾贩娣,X杞村绉y鐩稿弽,Y杞村绉,x鍓嶉潰娣昏礋鍙;鍘熺偣瀵圭О鏈濂借...
