3道计算题,在线等!要详细步骤!速度!
(-1)的2011次方+(-2)+(-1/2)²-I-3I2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)先化简,再求值:1/2(-4x&...
(-1)的2011次方+(-2)+(-1/2)²-I-3I
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
先化简,再求值:1/2(-4x²+2x-1)-(x-1/2),其中x=1/2 展开
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
先化简,再求值:1/2(-4x²+2x-1)-(x-1/2),其中x=1/2 展开
3个回答
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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
这三道题你刚才已经提问过了呀
=-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
这三道题你刚才已经提问过了呀
展开全部
(-1)的2011次方+(-2)+(-1/2)²-I-3I
=-1-2+1/4-3
=-5.75
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
=2×(-1)+9/15*5/3
=-2+3/5
=-7/5
1/2(-4x²+2x-1)-(x-1/2)
=-2x^2+x-1/2-x+1/2
=2x^2
=2*1/4
=1/2
=-1-2+1/4-3
=-5.75
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
=2×(-1)+9/15*5/3
=-2+3/5
=-7/5
1/2(-4x²+2x-1)-(x-1/2)
=-2x^2+x-1/2-x+1/2
=2x^2
=2*1/4
=1/2
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1.9986391
x
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99999
x
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99999
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