（1-k）（k-3）＜0
    28x^2＋12x＋23＞0
    28x^212x＋23＞0
    25k^2-14k/1＜1
    9-4m<0
    40x＋20（8－x）≥200 10x十20（8一x）≥120
    2×0.5x＋2700＜10x
    （-1+x^3）/(1+x-x^2)>0
    -x2+2x+3>0
    2x2-3x-2<=0
    4-12a≥0
    4+12a≥0
    ex^2-(2e+1)x+e-2<0
    5/3*e6*（x+3）*ex＜x+1
    2*e5*（x+3）*ex＜x+1
    2-（5-2x）/2<= 2x-1
     1-4（x-1）^2≥0
    (1-2x)(2x-1)≥0
    215.21<215.21(1+x%)*0.8<215.21(1+10%)
    877.68<877.68(1+x%)*0.8<877.68(1+5%)

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