已知a=2011,求|a^2-5a+9|-4|a^ - 知识问答

已知a=2011,求|a^2-5a+9|-4|a^2+2a+2|+3a+7的值

1个回答

|a²-5a+9|-4|a²+2a+2|+3a+7
=a²-5a+9-4(a²+2a+2)+3a+7)
=a²-5a+9-4a²-8a-8+3a+7
=-3a²-10a+8
=-(3a²+10a-8)
=-(a+4)(3a-2)
=-(2011+4)(3×2011-2)
=-2015×6031
=-12152465

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