165.8566-0.0524934x=167.7353-(x-7)/4
    arctanx+arctan(0.5*x)=45
    x^3-x^2+x+4=0
    165.8566+0.0524934x=167.3285-(x-7)/4
    arctan1
    arctan0.5
    sin30
    0.66+1.36*0.08*(5.62+x*70) = 0.9+1.36*0.06*70
    0.66 + 1.36 * 0.08 * (5.62 + x*70) = 0.9 + 1.36 * 0.08 * 70
    x-1+sqrt(1-x^2)=sqrt(2)-sqrt(2-2*x^2)
    -1/x÷x^4=0
    -1/x^5=0
    -1/x^(2)
    2.7=10^(11.76-2x)+10^(2.76-x)+10^(50.86-3x)+10^(67.36-5x)+10^(90.56-6x)+10^(41.52-5x)
    [(700*12*0.9)-(70%*130X*6.4%)]/[(30%*130X)+(5%*130X)]=3.8%
    (40-x)15
    (700*12*0.9-70%*130X*6.4%)/(30%*130X+5%*130X)=3.8%
    x^3-140*x^2+600*x+192000=0
    441x-80x^3=0
    2x减3.2等于5.4

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