8.442+52.03x=93.62+1157x*(1-x)/(1-0.45x)+0.484x+(0.2475xx)/(1-0.45x)*4.18/32
    (4.895x-6289.323)*(4.895x-6289.323)+(x-1284.855)*(x-1284.855)-3025=0
    x^3 -sin(x) -12x +1=0
    x^3+2*x^2+3*x+4 = 0
    x^3+2*x^2+3*x+4=0
    x -1/5x =128
    3*x*x*x -sin(x) -12x +1=0
    (415-x)/(415*x*(x-1))=0.000464
    x^(2)－0.5x＝360
    1/2 - 2x + x + 1/6 < 0
    12000x－12x^2>=10000
    -2x^(2)+136x-1800=350
    (415-x)/(415*x*(x-1))=0.0015
    1200x－6╱5x^2>=10000
    1－2*x^2＋x^3
    (415-x)/(415*x*(x-1))=0.00046
    (415-x)/(415*x*(x-1))=0.00153
    3x^2－3000x+25000=0
    1/20*(16-x)+7/100*x
    1/20*(16-x)+43/432*x=1

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