1-(3a-1)-a平方,其中a=-99,化简求值

分类: 作业答案 • 2021-12-20 01:31:52

问题描述：

答

解:1-(3a-1)-a平方
=2-3a-a^2
=-(a^2-2a+1)-5a+3
=-(a-1)^2-5(a-1)-2
=-10000+500-2
=-9502

答

1-(3a-1)-a^2
=-a^2-3a+2
=-(a^2+3a-4)-2
=-(a+4)(a-1)-2
=-(-95)*(-100)-2
=-9500-2
=-9502