2x的平方-5x-3=0 2x²-5x-3=0 用配方法解方程？
2x\u5e73\u65b9\uff0d5x\uff0d3\uff1d0\u89e3\u5f97\u8fc7\u7a0b\u89e3\uff1a
\u56e0\u5f0f\u5206\u89e3
\uff082x+1\uff09\uff08x-3\uff09=0
\u89e3\u5f97x=-1/2\u6216x=3
~\u5982\u679c\u4f60\u8ba4\u53ef\u6211\u7684\u56de\u7b54\uff0c\u8bf7\u53ca\u65f6\u70b9\u51fb\u3010\u91c7\u7eb3\u4e3a\u6ee1\u610f\u56de\u7b54\u3011\u6309\u94ae~
~\u624b\u673a\u63d0\u95ee\u7684\u670b\u53cb\u5728\u5ba2\u6237\u7aef\u53f3\u4e0a\u89d2\u8bc4\u4ef7\u70b9\u3010\u6ee1\u610f\u3011\u5373\u53ef\u3002
~\u4f60\u7684\u91c7\u7eb3\u662f\u6211\u524d\u8fdb\u7684\u52a8\u529b~~
O(\u2229_\u2229)O\uff0c\u4e92\u76f8\u5e2e\u52a9\uff0c\u795d\u5171\u540c\u8fdb\u6b65\uff01
\u3010\u5341\u5b57\u76f8\u4e58\u6cd5\u3011
2x²-5x-3=0
\u89e3\uff1a\uff082x+1\uff09\uff08x-3\uff09=0
\u6709\uff0c2x+1=0\uff0c\u548c x-3=0\uff0c
\u89e3\u5f97\uff0cx= -1/2\uff0c\u548c x=3\uff1b
\u7ecf\u68c0\u9a8c\uff0cx= -1/2\u548cx=3\u662f\u539f\u65b9\u7a0b\u7684\u89e3\u3002
2x^2-5x-3=0(2x+1)(x-3)=0x1=-1/2 x2=3
3和-2分之1
式子不好列 但是你可以使用完全平方公式 就可以了
绛旓細瑙ｏ細鍥犲紡鍒嗚В 锛2x+1锛夛紙x-3锛=0 瑙ｅ緱x=-1/2鎴杧=3 ~濡傛灉浣犺鍙垜鐨勫洖绛旓紝璇峰強鏃剁偣鍑汇愰噰绾充负婊℃剰鍥炵瓟銆戞寜閽畘~鎵嬫満鎻愰棶鐨勬湅鍙嬪湪瀹㈡埛绔彸涓婅璇勪环鐐广愭弧鎰忋戝嵆鍙倊浣犵殑閲囩撼鏄垜鍓嶈繘鐨勫姩鍔泘~O(鈭鈭)O锛屼簰鐩稿府鍔╋紝绁濆叡鍚岃繘姝ワ紒
绛旓細X=3鎴朮=-1/2 璇烽噰绾
绛旓細瑙ｏ細鍥犲紡鍒嗚В 锛2x+1锛夛紙x-3锛=0 瑙ｅ緱x=-1/2鎴杧=3 ~濡傛灉浣犺鍙垜鐨勫洖绛旓紝璇峰強鏃剁偣鍑汇愰噰绾充负婊℃剰鍥炵瓟銆戞寜閽畘~鎵嬫満鎻愰棶鐨勬湅鍙嬪湪瀹㈡埛绔彸涓婅璇勪环鐐广愭弧鎰忋戝嵆鍙倊浣犵殑閲囩撼鏄垜鍓嶈繘鐨勫姩鍔泘~O(鈭鈭)O锛屼簰鐩稿府鍔╋紝绁濆叡鍚岃繘姝ワ紒
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