(2x一1)平方等于多少 (2x一y)的平方等于多少
\uff082x\u4e001\uff09\u7684\u5e73\u65b9\u7b49\u4e8e25\u7684\u89e3\u4f60\u5e94\u8be5\u8bb0\u5f97\u6709\uff08a-b\uff09\u7684\u5e73\u65b9=a\u65b9-2ab+b\u65b9 \u6240\u4ee5\u540c\u7406\uff1a
\u539f\u5f0f=\uff082x\uff09\u65b9-2\u00b72x\u00b7y+y\u65b9
=4x\u65b9-4xy+y\u65b9
4x平方加1减2x
4x+1-4x
=4x²-4x +1
=4x^2-4x+1
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绛旓細鍥炵瓟锛氳В (2x+1)^2-6=0 鈭 (2x+1)^2=6 鈭 2x+1=卤鈭6 鈭磝=(鈭6-1)/2 鎴杧=(-鈭6-1)/2
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绛旓細锛2X-1锛²=5锛2X-1锛夎В锛4X²-4X+1=10X-5 4X²-14X+6=0 2X²-7X+3=0 锛2X-1锛夛紙X-3锛=0 X1=1/2 X2=3
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绛旓細瑙ｆ湁(2x-1)^2=9 寮骞虫柟寰2x-1=3鎴2x-1=-3 瑙ｅ緱x=2鎴杧=-1
绛旓細杩欎釜鏂圭▼鏄涓嶅瓨鍦ㄥ疄鏁版牴鐨勶紝鍥犱负锛2x-1)鐨骞虫柟涓嶅彲鑳绛変簬-8锛屾墍鏈夌殑骞虫柟閮戒笉鍙兘涓鸿礋鏁般備絾鏄繖涓柟绋嬪瓨鍦ㄨ櫄鏍癸紝锛2x-1锛鐨勫钩鏂=-8锛宨²绛変簬-1锛屾墍浠ワ紙2x-1)²=8i²锛屾墍浠2x-1=锛2鏍瑰彿2)i锛屾墍浠=锛堟牴鍙2)i+浜屽垎涔嬩竴銆傝櫄鏍规槸楂樹腑鐨勭煡璇嗭紝濡傛灉杩樻湭娑夊強鍒拌繖浜涚煡璇嗭紝閭ｅ氨...
绛旓細瑙ｏ細鈭2x涓1鐨骞虫柟鏍鏄姝ｈ礋3 鈭 2x涓1=9 2x=10 x=5 鍙 xy=1/2 鈭 y=1/10 鈭 3x=15 4y=2/5
