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我觉得原题应该是有误的,如果是这样:x²-
4x+3
=
0
的话,可以作如下解答.x²
-
4x
+
3
=
0
(x
-
1)(x
-
3)=
0
x
-
1
=
0或x
-
3
=
0
∴
x1
=
1,x2
=
3也许x²-4x-3=0也能解吧,只不过不能用因式分解法,要用公式法.x²-4x+4-4-3
=
0(x-2)²-7
=
0(x-2)²-(√7)²
=
0(x-2+√7)(x-2-√7)
=
0x-2+√7
=
0或x-2-√7
=
0∴
x1
=
2-√7,x2
=
2+√7
4x+3
=
0
的话,可以作如下解答.x²
-
4x
+
3
=
0
(x
-
1)(x
-
3)=
0
x
-
1
=
0或x
-
3
=
0
∴
x1
=
1,x2
=
3也许x²-4x-3=0也能解吧,只不过不能用因式分解法,要用公式法.x²-4x+4-4-3
=
0(x-2)²-7
=
0(x-2)²-(√7)²
=
0(x-2+√7)(x-2-√7)
=
0x-2+√7
=
0或x-2-√7
=
0∴
x1
=
2-√7,x2
=
2+√7
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