问题
计算题
化简:(1)3a+2﹣4a﹣5;
(2)2(x2+3)﹣(5﹣x2)
答案
解:(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)
解:(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.