题目内容
计算:(1)-x(3x-1)-(-
x-1)(
x-1)
(2)[(-ab2)2•(-2a2)+
a3b3+
a2b2]÷(
ab)2-(-ab-1)2.
| 3 |
| 3 |
(2)[(-ab2)2•(-2a2)+
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
(1)-x(3x-1)-(-
x-1)(
x-1)
=-3x2+x+(
x+1)(
x-1)
=-3x2+x+3x2-1
=x-1;
(2)[(-ab2)2•(-2a2)+
a3b3+
a2b2]÷(
ab)2-(-ab-1)2
=[a2b4•(-2a2)+
a3b3+
a2b2]÷
a2b2-(ab+1)2
=(-2a4b4+
a3b3+
a2b2]÷
a2b2-(a2b2+2ab+1)
=-8a2b2+2ab+1-a2b2-2ab-1
=-9a2b2.
| 3 |
| 3 |
=-3x2+x+(
| 3 |
| 3 |
=-3x2+x+3x2-1
=x-1;
(2)[(-ab2)2•(-2a2)+
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
=[a2b4•(-2a2)+
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
=(-2a4b4+
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
=-8a2b2+2ab+1-a2b2-2ab-1
=-9a2b2.
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