22607÷x×20000=86
    22607÷x×20000=86.4332
    5cosx/x+1
    4482.82*e^(-0.09x)+355.56x = 4456.82
    4482.82*e^(-0.09x)+355.56x = 4516.82
    4482.82*e^(-0.09x)+355.56x=4486.82
    4482*e^(-0.09x)-355.56x=4486.82
    10X+230*10=2500*2X
    （21.16+x）*0.005=1.05x
    （40-x）（8+0.004x）-20x-320=1184
    -1/3x-4/3=-3x+12
    5t^2+6t-0.12
    arctan(x)
    4.32*（20-x）+210.4+92.6=（6.48*x+188+25+50）/1.5
    7(x+19)=784
    （5x-2)*2=6
    (−1/5 + 6x/25)^2 + (2/5 − 12x/25)^2
    0.0115=(0.71*0.1365^2)*(arccos((0.1365-h)/0.1365))-((0.1365-h)/0.1365)*(1-((0.1365-h)/0.1365)^2)^0.5
    0.0115=(1+(2*0.1365）/(3*0.71))*(0.71*0.1365^2)*((arcsin(h-0.1365)/0.1365)+(((h-0.1365)/(0.1365^2))*(0.1365^2-(h-0.1365)^2)^0.5）+（3.14/2))
    0.0115=(1+((2*0.1365）/(3*0.71)))*(0.71*0.1365^2)*((arcsin(h/0.1365)+((h/(0.1365^2))*(0.1365^2-h^2)^0.5）+（3.14/2))

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