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-x²-2x+3=0怎么做?
1个回答
展开全部
先把负号去掉,就在每一项都加一个负号,式子变成:
x²
+
2x
-
3
=
0
x²
+
2x
=
3
x²
+
2x
+
1
=
3
+
1
(x
+
1)²
=
4
x
+
1
=
±
2
x1
=
1
x2
=
-3
x²
+
2x
-
3
=
0
x²
+
2x
=
3
x²
+
2x
+
1
=
3
+
1
(x
+
1)²
=
4
x
+
1
=
±
2
x1
=
1
x2
=
-3
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