题目内容
化简:
(1)4x2+2x-6x2+3x;
(2)3y2-[4y-(5-2y)+2y2].
(1)4x2+2x-6x2+3x;
(2)3y2-[4y-(5-2y)+2y2].
分析:(1)先找出同类项,再进行合并即可;
(2)先去括号,再合并同类项即可.
(2)先去括号,再合并同类项即可.
解答: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.
=-2x2+5x;
(2)原式=3y2-(4y-5+2y+2y2)
=3y2-4y+5-2y-2y2
=(3y2-2y2)+(-4y-2y)+5
=y2-6y+5.
点评:本题考查了整式的加减,合并同类项以及去括号、添括号,是基础知识比较简单.
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