问题
解答题
化简:
(1)a+(5a-3b)-(a-2b);
(2)2(x2-3x-1)-(-5+3x-x2).
答案
(1)a+(5a-3b)-(a-2b),
=a+5a-3b-a+2b,
=5a-b;
(2)2(x2-3x-1)-(-5+3x-x2),
=2x2-6x-2+5-3x+x2,
=3x2-9x+3.
化简:
(1)a+(5a-3b)-(a-2b);
(2)2(x2-3x-1)-(-5+3x-x2).
(1)a+(5a-3b)-(a-2b),
=a+5a-3b-a+2b,
=5a-b;
(2)2(x2-3x-1)-(-5+3x-x2),
=2x2-6x-2+5-3x+x2,
=3x2-9x+3.