问题 计算题

合并同类项:

(1)5xy2+2x2y﹣3xy2﹣x2y                        

(2)﹣2x+5(x+2y)﹣(x﹣3y)

答案

解:(1)5xy2+2x2y﹣3xy2﹣x2y=5xy2﹣3xy2+2x2y﹣x2y=2xy2+x2y;  

(2)﹣2x+5(x+2y)﹣(x﹣3y)=﹣2x+5x+10y﹣x+3y=2x+13y.

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