297.5-297.5X=158
    25*x^6+264*x^4-1776*x^2+6400+20*2^1/2
    0.04×x^4+1.174×x^2+8.96×x+24=0
    4.191=（24.1*0.449*（x+0.1））/（1+0.449（x+0.1））*（100-9.66-1.06）/100*1/(1+0.31*1.06)+（2.86（x+0.1））/（1.36*0.101325）
    4.9t^2-7t+1.6=0
    2^(96)*((1-2^(-8)*(2^4-1)/2^4))^(2^(t-9)) = 2^(70)
    S/19.5-1/20=S/21
    S/19.5+1/20=S/21
    2^(96)*((1-2^(-8)*(2^(-4)-1)/2^(-4))^(2^(t-9))) = 2^(70)
    2^(96)*((1-2^(-8))^(2^(t-9))) = 2^(70)
    2^(96)*((1-2^(-8)*(2^(-4)-1)/2^(-4)))^(2^(t-9)) = 2^(70)
     x-x*0.065-(x+154.27）*0.0003 = 154.27
    x-x*0.065-(x+5552706.28）*0.0003=5552706.28
    x-x*0.05-(x+11335591.52）*0.0003=11335591.52
    x-x*0.05-(x+9476949.18）*0.0003=9476949.18
    600+480/x=-0.04*(70+105/(1+2.5/x))^2+14*(70+105/(1+2.5/x))
    lnsinx
    520+600/x=-0.04*(70+105/(1+2.9825/x))^2+14*(70+105/(1+2.9825/x))
    520+600/x=-0.04*(70+105/(1/1.193+2.5/x))^2+14*(70+105/(1/1.193+2.5/x))
    520+600/x=-0.04*(70+105/(1/1.193+2.5/x))^2+14*(70+105/(1/1.193+2.5/x))

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