(-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(-4x²+2x-1)-(x-1/2),其中x=1/2
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![(-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(-4x²+2x-1)-(x-1/2),其中x=1/2](/uploads/image/z/1165105-1-5.jpg?t=%EF%BC%88-1%EF%BC%89%E7%9A%842011%E6%AC%A1%E6%96%B9%2B%EF%BC%88-2%EF%BC%89%2B%EF%BC%88-1%2F2%EF%BC%89%26%23178%3B-I-3I2%C3%97%5B3-%28-2%29%26%23178%3B%5D%2B%28-1%2F3-4%2F15%EF%B9%9A%C3%B7%EF%BC%88-3%2F5%EF%BC%89%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A1%2F2%EF%BC%88-4x%26%23178%3B%2B2x-1%EF%BC%89-%EF%BC%88x-1%2F2%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D1%2F2)
(-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(-4x²+2x-1)-(x-1/2),其中x=1/2
(-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
(-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(-4x²+2x-1)-(x-1/2),其中x=1/2
(-1)的2011次方+(-2)+(-1/2)²-I-3I
=-1-2+1/4-3
=-6+1/4
=-23/4;
2×[3-(-2)²]+(-1/3-4/15﹚÷(-3/5)
=2×(3-4)+(-5/15-4/15)×(-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
=-2×(1/4)
=-1/2;
(-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:...
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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
收起
-1-2+1/4-3=-23/4
2*(-1)+(-3/5﹚÷(-3/5)=-2+1=-1
-2x^2=-1/2