6^75=77
    a*1.45*1.4*300/(300+406)*2+a*1.45*300/(300+406)+64720*0.2<64720
    a*1.45*1.4*300/(300+406)*2+a*1.45*300/(300+406)+64720*0.2>64720
    x+1<>1
    x^4-2x^3-6x^2-2x<=0
    -2*x-12<8-2
    x-12<8-2
    x-12
    x-12<1
    （X*1.13-0.42*1.13)/(X*1.13)
    （4-4/5m*m+24/5m-4）*5-10-m（4-4/5m*m+24/5m-4）/2-（5-m）（4-4/5m*m+24/5m-4）/2≥0
    （X－20）（－2X＋80）＝150
    （X－20）（－20＋80）＝150
    1/(1+a)/(1+a)≥4*a*a/(9*a*a-9)
    -3*x^4+10*x^3+20*x^2-40*x<0
    -3*x^4+10*x^3+20*x^2-40*x+29<0
    x+3/x-4<0
    -3*x^4+10*x^3+20*x^2-40*x+30<0
    -3*x^4+10*x^3+20*x^2-40*x+31<0
    -3*x^4+10*x^3+20*x^2-40*x+32<0

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