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.
合并同类项:
(1)5xy2+2x2y﹣3xy2﹣x2y
(2)﹣2x+5(x+2y)﹣(x﹣3y)
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.