题目内容
计算;(1)(x-3y)(x-
y);
(2)4x2-(-2x+3)(-2x-3).
| 1 |
| 2 |
(2)4x2-(-2x+3)(-2x-3).
(1)(x-3y)(x-
y),
=x2-
xy-3xy+
y2,
=x2-
xy+
y2;
(2)4x2-(-2x+3)(-2x-3),
=4x2-(4x2-9),
=9.
| 1 |
| 2 |
=x2-
| 1 |
| 2 |
| 3 |
| 2 |
=x2-
| 7 |
| 2 |
| 3 |
| 2 |
(2)4x2-(-2x+3)(-2x-3),
=4x2-(4x2-9),
=9.
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