问题
解答题
计算或化简: (1)计算 (-2)2-(
(2)(-2x)2+(6x3-12x4)÷(3x2); (3)(3x+2)(3x-2)(9x2-4). |
答案
(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.
计算或化简: (1)计算 (-2)2-(
(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.