http://zhidao.baidu.com/question/509552095.html?quesup2&oldq=1
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(-1)的2011次方+(-2)+(-1/2)²-I-3I
=-1-2+1/4-3
=-6+1/4
=-5.75
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
=2×(3-4)+(1/3+4/15)×5/3
=-2+3/5×5/3
=-2+1
=-1
先化简,再求值:1/2(-4x²+2x-1)-(x-1/2),其中x=1/2
1/2(-4x²+2x-1)-(x-1/2)
=-2x²+x-1/2-x+1/2
=-2x²
当x=1/2时原式=-2×1/4=-1/2
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=-1-2+1/4-3
=-6+1/4
=-5.75
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
=2×(3-4)+(1/3+4/15)×5/3
=-2+3/5×5/3
=-2+1
=-1
先化简,再求值:1/2(-4x²+2x-1)-(x-1/2),其中x=1/2
1/2(-4x²+2x-1)-(x-1/2)
=-2x²+x-1/2-x+1/2
=-2x²
当x=1/2时原式=-2×1/4=-1/2
已经帮你解答,请采纳
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