题目内容
计算或化简:
(1)计算 (-2)2-(
)-1+
-(
)0;
(2)(-2x)2+(6x3-12x4)÷(3x2);
(3)(3x+2)(3x-2)(9x2-4).
(1)计算 (-2)2-(
| 1 |
| 2 |
| 3 | -8 |
| 2008 |
(2)(-2x)2+(6x3-12x4)÷(3x2);
(3)(3x+2)(3x-2)(9x2-4).
(1)原式=4-2-2-1=-1;
(2)原式=4x2+2x-4x2
=2x;
(3)原式=(9x2-4)(9x2-4)
=(9x2-4)2
=81x4-72x2+16.
(2)原式=4x2+2x-4x2
=2x;
(3)原式=(9x2-4)(9x2-4)
=(9x2-4)2
=81x4-72x2+16.
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