=4x²-5x+9-4(x²+2x+2)+3x+7
=4x²-5x+9-4x²-8x-8+3x+7
=-10x+8
代入x=2012,得
原式=-20112
已知x=2012,求|4x²-5x+9|-4|x²+2x+2|+3x+7=?
已知x=2012,求|4x²-5x+9|-4|x²+2x+2|+3x+7=?
数学人气：884 ℃时间：2019-08-20 15:50:45
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