(X-1)的平方可以拆开吗?好像有什么公式的 数学题:(x-1)的平方+1=2(x-1) 用两种方法,一种...
(X-1)\u7684\u5e73\u65b9\u53ef\u4ee5\u62c6\u5f00\u5417?\u597d\u50cf\u6709\u4ec0\u4e48\u516c\u5f0f\u7684(X-1)\u7684\u5e73\u65b9=X^2-2X+1
\u89e3\uff08x-1)²+1\uff1d2(x-1),\u5f97
(x-1)(x-1)+1\uff1d2(x-1)
\uff08x-1-2\uff09\uff08x-1\uff09\uff1d\uff0d1
\uff08x-3\uff09(x-1)\uff1d\uff0d1
x²-4x+3\uff1d\uff0d1
x²-4x\uff1d\uff0d4
x\uff1d2
可以。(X-1)~2=X~2-2X+1
(X-1)的平方=X^2-2X+1
(x - 1)²
= (x - 1)(x - 1)
= x · x - 2 · x · 1 + 1 ²
= x ² - 2x + 1
绛旓細=锛坸-1)²-4(x-2)=(x-1)²-4(x-1-1)=(x-1)²-4(x-1)+4 =(x-1-2)²=(x-3)²瑙f硶鍒嗘瀽锛氬埄鐢ㄥ噾鍏冩硶锛屽厛鍖栦负x-1鐨勫紡瀛愶紝鐒跺悗鍒╃敤瀹屽叏骞虫柟鍏紡灏鍙互寰堝揩寰楀嚭缁撴灉銆
绛旓細(x-1)^2-2(x^2-1)=0 鎶鎷彿鎷嗗紑 (x^2-2x+1)-2x^2+2=0 鍖栫畝 x^2+2x-3 =0 鍒╃敤浜ゅ弶鐩镐箻娉 (x+3)(x-1)=0 x=-3 or 1 (x-1)^2-2(x^2-1)=0 瑙e嚭x=-3 or 1
绛旓細鐢变簬400=20²,256=16²,鎵浠鍙互灏嗘柟绋嬩袱杈瑰悓鏃跺紑骞虫柟,鏂圭▼灏辫浆鎹㈡垚涓鍏冧竴娆℃柟绋,杞崲鏃跺簲娉ㄦ剰卤闂銆 銆愯绠楄繃绋嬨戣В: 灏嗗師鏂圭▼鏀瑰啓鎴愪笅鍒楀舰寮 20²(1-x)²=16² 涓よ竟鍚屾椂寮骞虫柟,寰 20(1-x)=卤16 1-x=卤0.8 x=1卤0.8 鎵浠,x1=1+0.8=1.8,x2=1-0.8=0.2銆 銆愭湰棰樼煡璇嗙偣銆 鏂规牴(寮...
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绛旓細16 (x-1)鐨勫钩鏂=锛4x-4)鐨勫钩鏂
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绛旓細浣犲ソ锛侊紒锛(X-1)^2=X X^2-2X+1=X X^2-3X+1=0 鐗逛粬=(-3)^2-4*1*1=5 鎵浠ワ紝X1=(3-鈭5)/2 X2=(3+鈭5)/2 杩樻湁浠涔堜笉鏄庣櫧鐨勫湴鏂瑰啀闂垜銆傝阿璋紒锛侊紒
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