题目内容
计算题:
(1)2(m+1)2-(2m+1)(2m-1);
(2)28x4y2÷7x3y;
(3)(
+
)-
;
(4)|1-
|+|
-
|+|
-
|.
(1)2(m+1)2-(2m+1)(2m-1);
(2)28x4y2÷7x3y;
(3)(
| 3 |
| 2 |
| 2 |
(4)|1-
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
(1)2(m+1)2-(2m+1)(2m-1)=2m2+4m+2-4m2+1=-2m2+4m+3;
(2)28x4y2÷7x3y=4xy;
(3)(
+
)-
=
;
(4)|1-
|+|
-
|+|
-
|=
-1+
-
+
-
=2
-
-1.
(2)28x4y2÷7x3y=4xy;
(3)(
| 3 |
| 2 |
| 2 |
| 3 |
(4)|1-
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
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