先化简,再求值:11a2﹣[a2﹣3(2a﹣5a2)﹣4(a2﹣2a)],其中a=﹣.

先化简,再求值:11a2﹣[a2﹣3(2a﹣5a2)﹣4(a2﹣2a)],其中a=﹣

 

答案

【考点】整式的加减—化简求值.

【专题】计算题;整式.

【分析】原式去括号合并得到最简结果,把a的值代入计算即可求出值.

【解答】解:原式=11a2﹣a2+6a﹣15a2+4a2﹣8a=﹣a2﹣2a,

当a=﹣时,原式=﹣+=

【点评】此题考查了整式的加减﹣化简求值,熟练掌握运算法则是解本题的关键.

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