问题
解答题
化简:
(1)5m+(4n-3m)-(-3m+n);
(2)-(2a2+5)-(3a2-2)-2(-4a2-1).
答案
(1)原式=5m+4n-3m+3m-n,
=5m+3n;
(2)原式=-2a2-5-3a2+2+8a2+2,
=3a2-1.
化简:
(1)5m+(4n-3m)-(-3m+n);
(2)-(2a2+5)-(3a2-2)-2(-4a2-1).
(1)原式=5m+4n-3m+3m-n,
=5m+3n;
(2)原式=-2a2-5-3a2+2+8a2+2,
=3a2-1.