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.

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