（x-1）2-1=8，这道题我不会啊，解方程啊，是八年级的，平方根啊，立方根的 （1）已知2x+1的平方根为±5，求5x+4的立方根．（2）...
x\u7684\u7acb\u65b9\u51cf\u4e8c\u5341\u4e03\u5206\u4e4b\u516b\u7b49\u4e8e\u96f6\uff0c\u89e3\u65b9\u7a0b\u554a\uff0c\u6211\u4e0d\u4f1a\u554a\uff0c\u662f\u5173\u4e8e\u4ec0\u4e48\u5e73\u65b9\u6839\u554a\uff0c\u7acb\u65b9\u6839\u7684x\u7684\u7acb\u65b9\u51cf\u4e8c\u5341\u4e03\u5206\u4e4b\u516b\u7b49\u4e8e\u96f6
\u89e3\uff1ax³=27/8
x³=3³/2³
x=3/2
\u5e73\u65b9\u6839\u5c31\u662f\u628a\u4e00\u4e2a\u6570\u5f00\u5e73\u65b9\uff0c\u6bd4\u59824\u7684\u5e73\u65b9\u6839=\u00b12\uff0c\u56e0\u4e3a\u00b12\u7684\u5e73\u65b9\u90fd\u662f4\uff0c2\u7684\u5e73\u65b9=2\u00d72=4 \uff0c-2\u7684\u5e73\u65b9=-2\u00d7-2=4
\u7acb\u65b9\u6839\u5c31\u662f\u628a\u4e00\u4e2a\u6570\u5f00\u7acb\u65b9\uff0c\u6bd4\u59828\u7684\u7acb\u65b9\u6839=2\uff0c\u56e0\u4e3a2\u7684\u7acb\u65b9\u662f8\uff0c2\u7684\u7acb\u65b9\u5c31\u662f2\u00d72\u00d72=8
\uff081\uff09\u223525\u7684\u5e73\u65b9\u6839\u4e3a\u00b15\uff0c\u22342x+1=25\uff0c\u89e3\u5f97\uff1ax=12\uff0c\u22345x+4=64\uff0e\u223435x+4=364=4\uff0c\u53735x+4\u7acb\u65b9\u6839\u4e3a4\uff1b\uff082\uff09\u22359\u7684\u7b97\u672f\u5e73\u65b9\u6839\u662f3\uff0c\u2234x+y=9\uff1b\u2235\uff08x-y\uff092=\uff08x+y\uff092-4xy=9\uff0c\u223492-4xy=9\uff0c\u89e3\u5f97\uff0cxy=18\uff0e\u6216\uff1a\uff08x+y\uff092=x2+2xy+y2=81\u2460\uff08x-y\uff092=x2-2xy+y2\u2461\u2460-\u2461\uff0c\u5f974xy=72\uff0c\u89e3\u5f97xy=18\uff0e
（x-1）2-1=8（x-1）2=9
(X-1)=3或x-1=-3
所以x=4或x=-2
希望对你有帮助
(X-1)^2-1=8
(X-1)^2=9
X-1=3,-3
X=4,-2
希望能帮助你，如果不懂可以追问，弄懂请及时采纳。谢谢
（x-1)²=9
x-1=±3
x=1±3
x1=1+3=4, x2=1-3=-2
（xc-1)²=9
x-1=-3,x-1=3
所以x=-2,x=4
(x-1)^2-1=8
x-1=±3
x=4或x=-2
这个简单
答案是X1=4，X2=-2
绛旓細杩欎釜鏂圭▼鍙互鎶x-1鐪嬫垚涓涓暣鐨勫紡瀛愶紝璁惧叾涓簓鍘熸潵鐨勫紡瀛愬氨鍙樻垚y^2-2y+2=0瑙ｈ繖涓柟绋嬪緱鍑簓鐨勫间互鍚庡啀鎶婂畠甯﹀叆鍒皒+1閲岄潰灏卞彲浠ヤ簡銆
绛旓細鏃犺В鍚锛1+2+3+4+5+6+7+8=36,x1-x2=1,x3-x4=2,x5+x6=7,x7+x8=9,鍒檟1+x2+x3+x4=36-9-7=20,鍙坸1=x2+1,x3=x4+2,寰2*x1+1+2*x3+2=20,2*(x1+x3)=17,鏃犺В
绛旓細3(x-1)-2(4x)=6 3x- 3-8 x=6銆8x-3 x绛変簬-3-6銆備簲x=- 9銆X=- 9/5銆
绛旓細(x-1)^2 (x-2)=0 j鍗筹細(x-1)²=0 x=1 鎴栵紙x-2)=0 x=2 鈭(x-1)^2 (x-2)=0鐨勮В鏄痻=1鎴杧=2銆
绛旓細涓嶇煡閬杩欓亾棰鐨勫噯纭瓟妗,"涔熻灏辨病鏈夊噯纭瓟妗,灏辨槸鑰冧竴涓嬩綘鐨勬濊矾,"濂瑰鏄 璇淬 7銆佺涓冮鏄17鍒嗛挓,1,2鍏堣繃鍘,璁2鍒嗛挓,鍥炴潵1鍒嗛挓,5,10杩囧幓,璁10鍒嗛挓,2鍒嗛挓鍥炴潵,鐒跺悗1,2涓璧疯繃鍘,璁2鍒嗛挓,鎵浠ユ槸2+1+10+2+2=17 8銆佷袱杈逛竴璧风儳銆 9銆佺瓟妗堜箣涓:浠庨夯鐪佺悊宸ュぇ瀛︿竴浣嶈绠楁満绯绘暀鎺堥偅閲屽惉鏉ョ殑绛旀...
绛旓細瑙ｏ細鈶2/1锛2x-1锛²-32锛0锛堝紑骞虫柟娉曪級鍓嶉潰閭ｄ釜鏄寚浜屽垎涔嬩竴鍚 (2x-1)²=64 寮骞虫柟 2x-1=卤8 2x=9鎴-7 x=9/2鎴-7/2 鈶3x²+4x+1锛0锛堥厤鏂规硶锛(3x+1)(x+1)=0 x=-1/3鎴-1 鈶²-x-1锛0锛堝叕寮忔硶锛壩=1+4=5 x=(1卤鈭5)/2 鈶²...
绛旓細3x-2(x+1)=8 3x-2x-2=8 x=8+2 x=10 浣犵湡鏄剳娈嬪埌瀹讹紝杩欐牱鐨勯涓嶄細鍋氫篃缃簡锛屽嚭鏉ラ棶锛屽眳鐒惰繕閫変竴涓洿鍔犺剳娈嬬殑绛旀锛
绛旓細(X-1)*1/7+1=(X-2)*1/5 1/7x-1/7+1=1/5x-2/5 1/5x-1/7x=1+2/5-1/7 2/35x=44/35 x=22
绛旓細绠楁湳鍋氭硶 (2+4)梅(4-2)=6梅2 =3.(3+1)脳2 =4脳2 =8.杩欎釜鍒嗘暟鏄叓鍒嗕箣涓夈備唬鏁板仛娉 璁捐繖涓垎鏁颁负x/y.(x+1)/y=1/2. (x-1)/y=1/4.y=2(x+1). y=4(x-1).2(x+1)=4x(-1).2x+2=4x-4.4x-2x=2+4.2x=6.x=3.y=2脳(3+1)=8.x=3. y=8.杩欎釜鍒嗘暟...
绛旓細x(x-1)=91 x^2-x-91=0 (x-1/2)^2 = 365/4 x= (1+鈭365)/2 or (1-鈭365)/2
