题目内容
若a+6b=0,则(1-
)÷
=______.
| b |
| a+2b |
| a2+2ab+b2 |
| a2-4b2 |
原式=
÷
=
•
=
,
∵a+6b=0,
∴a=-6b,
则原式=
=
=
.
故答案是:
.
| a+b |
| a+2b |
| (a+b)2 |
| (a+2b)(a-2b) |
=
| a+b |
| a+2b |
| (a+2b)(a-2b) |
| (a+b)2 |
=
| a-2b |
| a+b |
∵a+6b=0,
∴a=-6b,
则原式=
| -6b-2b |
| -6b+b |
| -8b |
| -5b |
| 8 |
| 5 |
故答案是:
| 8 |
| 5 |
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