问题 计算题

化简:

(1)4xy﹣3x2﹣3xy+2x2

(2)﹣3(2x2﹣xy)﹣(x2+xy﹣6).

答案

解:(1)4xy﹣3x2﹣3xy+2x2

=(4xy﹣3xy)+(2x2﹣3x2

=xy﹣x2

(2)﹣3(2x2﹣xy)﹣(x2+xy﹣6)

=﹣6x2+3xy﹣x2﹣xy+6

=﹣7x2+2xy+6.

单项选择题
单项选择题