题目内容
计算:(1)
•
=______;
(2)
•
=______.
| 8x2 |
| 9y2 |
| 3y |
| -4x |
(2)
| a2+5a+6 |
| 2a+6 |
| a2+2a-8 |
| a2-4 |
(1)原式=
•
=-
.
(2)原式=
•
=
.
| 2x•4x |
| 3y•3y |
| 3y |
| -4x |
| 2x |
| 3y |
(2)原式=
| (a+2)(a+3) |
| 2(a+3) |
| (a+4)(a-2) |
| (a+2)(a-2) |
| a+4 |
| 2 |
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