cosx=1-10^-1.75
    i^2
    pi
    e^(-pi)
    30sqrt(1+(2.6x)^2)/(x*sqrt(1+0.01x^2)*sqrt(1+0.04x^2)*sqrt(1+(17.3x)^2))=1
    30x/(3.6*sqrt(1+0.01*3.6^2)*sqrt(1+0.04*3.6^2))=1
    90-arctan(0.1*x)-arctan(0.2*x)+6=40
    30=x*sqrt(1+0.01x^2)*sqrt(1+0.04x^2)
    2x^3-3x^2-4x+1=0
    x/（x+1）=2x/（3x+3）+1
    (x^2-4*x+3)*((x^5-9*x^4+28*x^3-35*x^2+15*x-1)*(x-1-2)-1*(x^4-7*x^3+15*x^2-10*x+1))+(6-2*x)*(x^5-9*x^4+28*x^3-35*x^2+15*x-1)=0
    (x^2-4*x+3)*((x^5-9*x^4+28*x^3-35*x^2+15*x-1)*(x-1-2)-1*(x^4-7*x^3+15*x^2-10*x+1))+(6-2*x)*(x^5-9*x^4+28*x^3-35*x^2+15*x-1)=0
    -57.3*0.8*x-arctanx=-180
    99.26=4*x+4*x^2+104*x^3
    (0.25-x)*(0.3-x)=0.625*(0.1+X)
    117342811.4-X-2991084.78-6616.34-11799138.74-5195181.88+1975943.54+51849.76+2274994.24-197318.28-5195181.88=37800559.73
    117342811.4-X-2991084.78-6616.34-11799138.74-5195181.88+1975943.54+51849.76+2274994.24-197318.28-5195181.88=13230834.93
    12-（-3）x{1/4+[-1/2]²}=
    X-X/(1+6%)*6.72%=305553.9
    （0.25-x）（0.3-x）=0.625（0.1+x）

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