问题
解答题
化简:
(1)3a2-2a+4a2-7a;
(2)a+(5a-3b)-(a-2b).
答案
(1)3a2-2a+4a2-7a=7a2-9a;
(2)a+(5a-3b)-(a-2b)=a+5a-3b-a+2b=5a-b.
化简:
(1)3a2-2a+4a2-7a;
(2)a+(5a-3b)-(a-2b).
(1)3a2-2a+4a2-7a=7a2-9a;
(2)a+(5a-3b)-(a-2b)=a+5a-3b-a+2b=5a-b.