题目内容
计算题和解方程
(1)(3
+1)(3
-1)-(
-2)2
(2)(2x+1)2=3(2x+1)
(1)(3
| 2 |
| 2 |
| 3 |
(2)(2x+1)2=3(2x+1)
(1)原式=(3
)2-12-[(
)2-4
+22]
=18-1-3+4
-4
=10+4
;
(2)移项得:(2x+1)2-3(2x+1)=0,
(2x+1)(2x+1-3)=0,
2x+1=0,2x+1-3=0,
解得:x1=-
,x2=1.
| 2 |
| 3 |
| 3 |
=18-1-3+4
| 3 |
=10+4
| 3 |
(2)移项得:(2x+1)2-3(2x+1)=0,
(2x+1)(2x+1-3)=0,
2x+1=0,2x+1-3=0,
解得:x1=-
| 1 |
| 2 |
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