问题
计算题
化简: (1)4x2+2x﹣6x2+3x;
(2)3y2﹣[4y﹣(5﹣2y)+2y2].
答案
解:(1)原式=(4x2﹣6x2)+(3x+2x)
=﹣2x2+5x;
(2)原式=3y2﹣(4y﹣5+2y+2y2)
=3y2﹣4y+5﹣2y﹣2y2
=(3y2﹣2y2)+(﹣4y﹣2y)+5
=y2﹣6y+5.
化简: (1)4x2+2x﹣6x2+3x;
(2)3y2﹣[4y﹣(5﹣2y)+2y2].
解:(1)原式=(4x2﹣6x2)+(3x+2x)
=﹣2x2+5x;
(2)原式=3y2﹣(4y﹣5+2y+2y2)
=3y2﹣4y+5﹣2y﹣2y2
=(3y2﹣2y2)+(﹣4y﹣2y)+5
=y2﹣6y+5.