题目内容
计算:
(1)
+
-
-|-
|+(
-2)0;
(2)(2x-3y)2-(2x+3y)(-3y+2x);
(3)因式分x3-6x2+9x.
(1)
| 3 | -8 |
2
|
| (-1)2 |
| 1 |
| 2 |
| 3 |
(2)(2x-3y)2-(2x+3y)(-3y+2x);
(3)因式分x3-6x2+9x.
(1)原式=-2+
-1-
+1=-1;
(2)原式=4x2-12xy+9y2-(4x2-9y2),
=18y2-12xy;
(3)原式=x(x2-6x+9)=x(x-3)2.
| 3 |
| 2 |
| 1 |
| 2 |
(2)原式=4x2-12xy+9y2-(4x2-9y2),
=18y2-12xy;
(3)原式=x(x2-6x+9)=x(x-3)2.
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