题目列表(包括答案和解析)
先化简,再求值:(4x2-3x) +(2+4x-x2 ) - (2x2+x+1), 其中x= -2 .
先化简,再求值:(4x2-3x) +(2+4x-x2 )-(2x2+x+1),其中x=-2.
| 1 | 2 |
| 2 |
| a+1 |
| 1 |
| a-1 |
| a |
| a2-1 |
| a+2 |
| 1-a2 |
| 2 |
| a+1 |
| a |
| 1-a |
| 3 |
| x2+4 |
| x |
| x2-4 |
| x2+2x |
| 1 |
| x+3 |
| x2-4 |
| x2+3x |
| x-2 |
| x2-1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| 2 |
| x2 |
| x-2 |
| 4 |
| 2-x |
| 1 |
| x2+2x |
| 2 |
| 1 |
| a-b |
| 1 |
| b+a |
| ab |
| a+b |
| 2 |
| 2 |
| x2+4x+4 |
| x+2 |
| 2 |
| 2 |
| a+1 |
| 1 |
| a-1 |
| a |
| a2-1 |
| a+2 |
| 1-a2 |
| 2 |
| a+1 |
| a |
| 1-a |
| 3 |
| x2+4 |
| x |
| x2-4 |
| x2+2x |
| 1 |
| x+3 |
| x2-4 |
| x2+3x |
| x-2 |
| x2-1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| 2 |
| x2 |
| x-2 |
| 4 |
| 2-x |
| 1 |
| x2+2x |
| 2 |
| 1 |
| a-b |
| 1 |
| b+a |
| ab |
| a+b |
| 2 |
| 2 |
| x2+4x+4 |
| x+2 |
| 2 |
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