问题 计算题

计算:3(x﹣y)﹣2(x+y)﹣5(x﹣y)+4(x+y)+3(x﹣y).

答案

解:3(x﹣y)﹣2(x+y)﹣5(x﹣y)+4(x+y)+3(x﹣y)

= 3(x﹣y)﹣5(x﹣y)+3(x﹣y)﹣2(x+y)+4(x+y)

= x﹣y+2(x+y)

= x﹣y+2x+2y

=3x+y.

单项选择题
单项选择题