题目内容
计算:
(1)(-
)÷(-
)3÷(
)3;
(2)(
)2÷(a2+ab)2•(
)2;
(3)
•
÷
;
(4)
÷
÷(x-1)2.
(1)(-
| b2 |
| 2a |
| b |
| a2 |
| 1 |
| ab |
(2)(
| a2-b2 |
| b |
| ab |
| b-a |
(3)
| a+2 |
| a2-2a+1 |
| a2-4a+4 |
| a+1 |
| a2-4 |
| a2-1 |
(4)
| x2-1 |
| x2+2x+1 |
| 2x2-2 |
| 4x2+8x+4 |
(1)原式=-
×(-
)×a3b3=
a8b2;
(2)原式=
•
•
=1;
(3)原式=
•
•
=
;
(4)原式=
•
•
=
.
| b2 |
| 2a |
| a6 |
| b3 |
| 1 |
| 2 |
(2)原式=
| (a+b)2(a-b)2 |
| b2 |
| 1 |
| a2(a+b)2 |
| a2b2 |
| (a-b)2 |
(3)原式=
| a+2 |
| (a-1)2 |
| (a-2)2 |
| a+1 |
| (a+1)(a-1) |
| (a+2)(a-2) |
| a-2 |
| a-1 |
(4)原式=
| (x+1)(x-1) |
| (x+1)2 |
| 4(x+1)2 |
| 2(x+1)(x-1) |
| 1 |
| (x-1)2 |
| 2 |
| (x-1)2 |
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