-3(3a^2-4)-(a^2-3a+5)+(4a-a^2),a=-3化简求值_数学解答

-3(3a^2-4)-(a^2-3a+5)+(4a-a^2),a=-3
化简求值

人气：217 ℃　时间：2020-06-03 17:45:05

解答

解-3(3a^2-4)-(a^2-3a+5)+(4a-a^2)
=-9a²+12-a²+3a-5+4a-a²
=-11a²+7a+7
=-11×（-3）²+7（-3）+7
=-99-21+7
=-113