x-11674.19=0.15x*0.05/10.5
    x^7+x+1=0
    x=tanx
    10077.75=x+0.06x
    100020.67=x+0.06x
    x+x÷2=x
    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

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