问题
解答题
计算: (1)5x+4x; (2)-5x2+
(3)6x-10x2+12x2-5x; (4)x3-x2+4-2x3-2+3x2. |
答案
(1)原式=9x;
(2)原式=-
x2;24 5
(3)原式=6x-5x-10x2+12x2=x+2x2;
(4)原式=x3-2x3+3x2-x2+4-2=-x3+2x2+2.
计算: (1)5x+4x; (2)-5x2+
(3)6x-10x2+12x2-5x; (4)x3-x2+4-2x3-2+3x2. |
(1)原式=9x;
(2)原式=-
x2;24 5
(3)原式=6x-5x-10x2+12x2=x+2x2;
(4)原式=x3-2x3+3x2-x2+4-2=-x3+2x2+2.