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.
化简:
(1)4xy﹣3x2﹣3xy+2x2;
(2)﹣3(2x2﹣xy)﹣(x2+xy﹣6).
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.