開方得:2x+3=±
5 |
解得:x1=-
3+
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2 |
?3+
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2 |
(2)方程變形得:x2+2x=99,
配方得:x2+2x+1=100,即(x+1)2=100,
開方得:x+1=10或x+1=-10,
解得:x1=9,x2=-11;
(3)分解因式得:(2x+1)(x-1)=0,
可得2x+1=0或x-1=0,
解得:x1=-
1 |
2 |
(4)方程移項得:4x(2x-1)-3(2x-1)=0,
分解因式得:(4x-3)(2x-1)=0,
解得:x1=
3 |
4 |
1 |
2 |
5 |
3+
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2 |
?3+
| ||
2 |
1 |
2 |
3 |
4 |
1 |
2 |