题目内容
计算或化简:(1)23-(
)0-(
)-2;
(2)(3x-1)(2x+3)-(x+3)(x-3).
| 1 |
| 2 |
| 1 |
| 2 |
(2)(3x-1)(2x+3)-(x+3)(x-3).
(1)23-(
)0-(
)-2,
=8-1-4,
=3;
(2)(3x-1)(2x+3)-(x+3)(x-3),
=6x2+7x-3-(x2-9),
=6x2+7x-3-x2+9,
=5x2+7x+6.
| 1 |
| 2 |
| 1 |
| 2 |
=8-1-4,
=3;
(2)(3x-1)(2x+3)-(x+3)(x-3),
=6x2+7x-3-(x2-9),
=6x2+7x-3-x2+9,
=5x2+7x+6.
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