摘要:18.化简:(4x2-2x-6)-2(2x2-2a-5)=
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化简,再请你用喜欢的数代入求值:
(1)
-
÷
;
(2)(
-
)÷
.(化简,再请你用喜欢的数代入求值)
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(1)
| 2 |
| a+1 |
| a-2 |
| a2-1 |
| a2-2a |
| a2-2a+1 |
(2)(
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x2-2x |
先化简,再求值:
(1)(
-
)÷
,其中a=2.
(2)(
-
)÷
,其中a=
-1.
(3)(
-4)÷
,其中x=-1.
(4)(1-
)÷
,其中x=6.
(5)
÷
+
,其中x=
+1.
(6)(
+
)•
,其中x=
(7)(
+
)÷
.其中a=
+1,b=
.
(8)
÷(x2+2x),其中 x=
.
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(1)(
| 2 |
| a+1 |
| 1 |
| a-1 |
| a |
| a2-1 |
(2)(
| a+2 |
| 1-a2 |
| 2 |
| a+1 |
| a |
| 1-a |
| 3 |
(3)(
| x2+4 |
| x |
| x2-4 |
| x2+2x |
(4)(1-
| 1 |
| x+3 |
| x2-4 |
| x2+3x |
(5)
| x-2 |
| x2-1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| 2 |
(6)(
| x2 |
| x-2 |
| 4 |
| 2-x |
| 1 |
| x2+2x |
| 2 |
(7)(
| 1 |
| a-b |
| 1 |
| b+a |
| ab |
| a+b |
| 2 |
| 2 |
(8)
| x2+4x+4 |
| x+2 |
| 2 |
先化简,再求值:
(1)(
-
)÷
,其中a=2.
(2)(
-
)÷
,其中a=
-1.
(3)(
-4)÷
,其中x=-1.
(4)(1-
)÷
,其中x=6.
(5)
÷
+
,其中x=
+1.
(6)(
+
)•
,其中x=
(7)(
+
)÷
.其中a=
+1,b=
.
(8)
÷(x2+2x),其中 x=
.
查看习题详情和答案>>
(1)(
| 2 |
| a+1 |
| 1 |
| a-1 |
| a |
| a2-1 |
(2)(
| a+2 |
| 1-a2 |
| 2 |
| a+1 |
| a |
| 1-a |
| 3 |
(3)(
| x2+4 |
| x |
| x2-4 |
| x2+2x |
(4)(1-
| 1 |
| x+3 |
| x2-4 |
| x2+3x |
(5)
| x-2 |
| x2-1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| 2 |
(6)(
| x2 |
| x-2 |
| 4 |
| 2-x |
| 1 |
| x2+2x |
| 2 |
(7)(
| 1 |
| a-b |
| 1 |
| b+a |
| ab |
| a+b |
| 2 |
| 2 |
(8)
| x2+4x+4 |
| x+2 |
| 2 |