初一数学题
\u521d\u4e00\u6570\u5b66\u9898\u89e3\uff1aab+a+b=bc+b+c=ac+a+c=3\uff0c\u5219ab+a+b+1=bc+b+c+1=ac+a+c+1=4
\u4e8e\u662f\uff0ca(b+1)+b+1=(a+1)(b+1)=4,\u540c\u7406\u5f97\uff1a(b+1)(c+1)=4,(c+1)(a+1)=4
\u4e09\u5f0f\u76f8\u4e58\u5f97\uff1a[\uff08a+1)(b+1)(c+1)]²=4\u00d74\u00d74=64
\u6240\u4ee5\uff1a\uff08a+1)(b+1)(c+1)=8
\u89e3\uff1a\u8bbe\u9700\u8981x\u5343\u514b\u7532\u79cd\u7cd6\u679c\u548cy\u79cd\u4e59\u79cd\u7cd6\u679c
\u7136\u540e\u89e3\u51fa\u56fe\u4e2d\u7684\u65b9\u7a0b\uff0c\u6211\u7b97\u51fa\u6765\u662fx=50,y=150
\u7b54\uff1a..........
=x²-（3k+3）xy-3y²-8
3k+3=0
k= -1
当k= -1时x²-3kxy-3y²-3xy-8不含xy的项
当k=-1时，
-3kxy=3xy，与后面的-3xy正好抵消。
-1
-1
绛旓細2x+17=35 3x-64=11 12+8x=52 0.8x-4.2=2.2 2x+5=10 3x-15=75 4x+4o=320 3x+77=122 5x-1.6=0.6 6x-4=20 10x-0.6=2.4 500-12x=140 1) 66x+17y=3967 25x+y=1200 绛旀锛歺=48 y=47 (2) 18x+23y=2303 74x-y=1998 绛旀锛歺=27 y=79 (3) 44x+90y=7796 4...
绛旓細1銆佽В锛氳琛ｆ湇浠峰紉鏋氶摱甯侊紝鐢棰鎰忓緱锛(x+2)梅(x+10)=7/12锛岃В寰梮=46/5锛屽嵆杩欎欢琛ｆ湇鍊46/5鏋氶摱甯併2銆佽В锛氳鏍囦环x鍏冿紝鐢遍鎰忓緱锛(90锛厁-250)梅250=15.2锛咃紝瑙ｅ緱x=320鍏冿紝鍗虫爣浠320鍏冦3銆佽В锛氳姣忕鏈墄涓骇鍝侊紝鐢遍鎰忓緱锛(8x+4)梅5=(11x+1)梅7+1锛岃В寰梮=12锛屽嵆姣忕...
绛旓細鎴朼=卤3锛宐=卤6锛屾鏃秔=卤9锛涙晠p鐨勫彲鑳藉彇鍊兼湁 卤19锛浡11锛浡9銆3銆佸凡鐭²-y²+x²+y²-8xy+9=0, 姹(x+y)²鐨勫笺傝繖閬棰鐨勬潯浠舵槸鍚︽妱閿欎簡锛熶富瑕佹槸 -y²+y²涓嶅氨鐩存帴娑堟帀鎴0浜嗕箞锛熷笇鏈涗綘鏍告煡淇敼鍚庡啀杩介棶濂戒簡銆4銆佽繖鍙堟槸涓閬撴妱閿欑殑棰...
绛旓細鍒濅竴鏁板鍙ｇ畻棰220閬 1.(1+1/2)(1+1/3)(1+1/4)...(1+1/100) 2.(1-1/2)(1-1/3)(1-1/4)...(1-1/100) 3.8+2-8+2 4.25*4/25*4 5.7.26-(5.26-1.5) 6.286+198 7.314-202 8.526+301 9.223-99 10.6.25+3.85-2.125+3.875 11.9-2456*21 12.0.5/11.5-4*2.75 13.1/2脳3/5 14.3...
绛旓細1) 66x+17y=3967 25x+y=1200 绛旀锛歺=48 y=47 (2) 18x+23y=2303 74x-y=1998 绛旀锛歺=27 y=79 (3) 44x+90y=7796 44x+y=3476 绛旀锛歺=79 y=48 (4) 76x-66y=4082 30x-y=2940 绛旀锛歺=98 y=51 (5) 67x+54y=8546 71x-y=5680 绛旀锛歺=80 y=59 (6) 42x-95y=...
绛旓細鍙仛鍚庨潰棰橈紝鍥犱负鍓嶉潰姣旇緝绠鍗曪細鈶碘憼姹傝瘉锛欳E=1/2AB 璇佹槑锛氬欢闀緾E鍒癋锛屼娇EF=CE锛 杩炴帴A'F銆丅'F锛屽垯鍥涜竟褰'CB'F鏄钩琛屽洓杈瑰舰锛堝瑙掔嚎浜掔浉骞冲垎鐨勫洓杈瑰舰鏄钩琛屽洓杈瑰舰锛 鈭碅'F=CB' 锛 A'C=B'F 鈭礐A'鈯A锛 CB'鈯B锛 鈭粹垹A'CB'+鈭燗CB=360掳鈥180掳=180掳 鑰屸垹A...
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绛旓細(1) x^2+2x-3=(x-1)(mx+n)鈭 x^2+2x-3 =mx^2+(n-m)x-n 鈭磎=1 n=3 (2)褰搙=-1鏃2x^2+5x+3=0 鈭2x^2+5x+3=(x+1)(mx+n)鈭磎=2 n=3 (3)姝ｇ‘ a=2,b=1,c=2 d=4
绛旓細鏍规嵁棰樻剰鍒楀嚭鏂圭▼:(X-12)*0.28-0.24X=11.2 0.28X-3.36-0.24X=11.2 0.04X=14.56 X=364 绛:璇ュ晢璐╁綋鍒濅拱杩364涓浮铔.6銆佹煇杞﹂棿鏈夋妧宸85浜猴紝骞冲潎姣忓ぉ姣忎汉鍙姞宸ョ敳绉嶉儴浠15涓垨涔欑閮ㄤ欢10涓紝2涓敳绉嶉儴浠跺拰3涓箼绉嶉儴浠堕厤涓濂楋紝闂姞宸ョ敳銆佷箼閮ㄤ欢鍚勫畨鎺掑灏戜汉鎵嶈兘浣挎瘡澶╁姞宸ョ殑鐢层佷箼...
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