1-(3a-1)-a平方,其中a=-99,化简求值
问题描述:
1-(3a-1)-a平方,其中a=-99,化简求值
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