（5－2k）^2－4k^2≥0
    （5－2k）－4k^2≥0
     0.948 * 10 ^ 5 * ( 55.44 ^ 1.77 / X ^ 4.77 ) * 196 * 0.399 ≤0.2 * 35
    10-x>4x
    x-3(x-2)<8
    6×2X>15×2X＾2
    0.948*10^5*（55.44^1.77/X^4.77）*196*0.422≤0.2*35
    0.948×10^5×[(59.4^1.77÷X^4.77)]×210×0.499≤0.2×35
    0.948×10^5×14.63^1.77÷X^4.77×110×0.412<0.2×20
    0.948×10^5×14.63^1.77÷X^4.77×110×0.412≤0.2×20
    0.948×10^5×14.63^1.74÷X^4.77×110×0.412<0.2×20
    x^2-sqrt3*x-1≤0
    0.861×10^5×15.68^1.74÷X^4.71×72×0.499<0.2×25
    100x+50(100-x)<=7650
    1+x>3
    x+3(100-x)>=250
    2x+(100-x)>=120
    3x-1/2+1>2x
    4＜x＋10＞＝5x
    5>-5X

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