sin x^1/2
    x×lnx-x×ln0.273=0.378
    xxx+3x-4=0
    X-X*0.065-(X+1582847)*0.0003=1582847
    （400+X）/32.07=14.47
    r3=54r-135
    r^3=54r-135
    4S^3+0.04S^2=5.61*10^-12
    x+（1000+x*576）/2080=29
    [(220+260+220)*21-x]*0.85+(8+8)*21=(220+220+260)*21*0.85+8*21
    [（220+220+260）*21-x]*0.85=（220+220+260）*21*0.85
    X-X*0.065-(X+1500000)*0.0003=1500000
    X-X*0.065-(X+1500000)*0.0003 = 1500000
    X-X*0.065-(X+1500000)*0.0003=1500000
    X-X*0.065-X*0.35-(X+1500000)*0.0003=1500000
    1.0×14.3×600×258.5+1.0×14.3（600-250）×120=360×X
    0.086=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    16.47=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    0.395=（（0.021*x^1.85+4.7）^0.5）*x^0.84
    0.01x^4+x^2=40000

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