Mathematics
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    x^3-6x-4=0
    (4410000+480^2)/(2*480)
    (4410000+480^2)/2*480
    (2+x)/2=5
    (x-2019)(x-2020) = 2021*2022
    x*3438/9=357.16
    3+2
    81=0.245x+(0.9×5÷76140)x^(3)
    (40-x)^2*(0.435*0.435+x^2)=(80^2+(40-x)^2)*1.5^2*x^2
    (82.4-x)^2*(0.435*0.435+x^2)=(177.7^2+(82.4-x)^2)*1.55^2*x^2
    (82.4-x)^2*(0.635*0.635+x^2)=(177.7^2+(82.4-x)^2)*1.55^2*x^2
    (82.4-x)^2=1
    28*x+3=9
    [ (15+12) x (35-x) + (11+12) x]x2+ [15x (35-x) +11x] x6=4400
    5.46+5.33=x
    -0.0299/0.000122*(e(-0.000122*10000)-e(-0.000122*1118.7))
    -0.0299/0.00122*(e(-0.000122*10000)-e(-0.000122*1118.7))
    -0.0299/0.00122*(e(-0.00122*10000)-e(-0.00122*1118.7))
    -0.2643/0.00207*(e(-0.00207*1118.7)-e(-0.00207*0))
    -0.0347/0.00004*(e(-0.00004*10000)-e(-0.00004*199.54))

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