0.82X7+0.77X=7.28
    16x＝384
    e(x+1)+2x2+3x=0
    3x<50+2x
    e(x+1)+2x2+x=0
    8x-1≥6x+3
    5+x=8
    (8.333/(0.65+H))^2+10*H-36.64=0
    10*H^3-22.34*H^2-41.717*H=84.32005
    x=26.8/(0.95*sqrt(2*9.8*(6.8-x*0.74)
    2/5k^（-3/5）=0.12
    55x=210
    x=36.7/(0.95*sqrt(2*9.8*(6.8-x*0.74)
    （x-4）(x^2-8x+12)-8(x-2)
    x^2+4x-285=0
    16.95161+2*(15+5.196x/1.5163)*0.02179088=x
    100000*(x*0.0001/(1.4128-x*0.0001))+500000*(x*0.0001/(4.3250-x*0.0001))+200000*（x/(14675.0000-x))-34.19-76.25>=0
    x×x－5x-6=0
    100000*(x*0.0001/(1.4128-x*0.0001))+500000*(x0.0001/(4.3250-x*0.0001))+200000*（x/(14675.0000-x))-34.19-76.25>=0
    2x<4-3(x-2)

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