题目内容
(1)计算(3
+
-4
)÷
;
(2)分解因式(x+2)(x+4)+x2-4.
| 18 |
| 1 |
| 5 |
| 50 |
|
| 32 |
(2)分解因式(x+2)(x+4)+x2-4.
(1)原式=(9
+
-2
)÷4
=8
÷4
=2;
(2)原式=(x+2)(x+4)+(x+2)(x-2)
=(x+2)[(x+4)+(x-2)]
=(x+2)(2x+2)
=2(x+2)(x+1).
| 2 |
| 2 |
| 2 |
| 2 |
=8
| 2 |
| 2 |
=2;
(2)原式=(x+2)(x+4)+(x+2)(x-2)
=(x+2)[(x+4)+(x-2)]
=(x+2)(2x+2)
=2(x+2)(x+1).
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