问题
解答题
化简:(1)3a+2-4a-5;(2)2(x2+3)-(5-x2)
答案
(1)3a+2-4a-5;
=(3-4)a+2-5,
=-a-3;
(2)2(x2+3)-(5-x2)
=2x2+6-5+x2,
=(2+1)x2+6-5,
=3x2+1.
化简:(1)3a+2-4a-5;(2)2(x2+3)-(5-x2)
(1)3a+2-4a-5;
=(3-4)a+2-5,
=-a-3;
(2)2(x2+3)-(5-x2)
=2x2+6-5+x2,
=(2+1)x2+6-5,
=3x2+1.