x^1500=0.95
    10x3-9x2+1=0
    (1/2)×620×100x^2+620×100×(440-665)x-(1/2)(440×2-665)×620×25x665
    (1/2)×620×100x^2+620×100×(440-665)x-(1/2)(440×2-665)×620×100×665
    arcccos0.1107203708672
    8a^3+4a^2-4a-1=0
    16a^5-20a^3-2a^2+5a+1=0
    16a^4-4a^3-6a^2-6a-1=0
    5/sin(x/(2×7)) + (5/sin((π - 2 x)/(2×21)) - 5/sin(x/(2×7))) cos(x) = 136
    X/126-15/200-(80-X)/500=0.34
     x-0.2x=120
    5/sin(x/(2×7)) + (5/sin((π - 2 x)/(2×21)) - 5/sin(x/(2×7))) cos(x) = 136
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx
    136=5/sin(x/(2*7))+(5/sin(π-2*x/2*7)-5/sin(x/(2*7)))cosx

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