x*(x+5)=300
    100=300X−2800000-160X
    1/(2*x*sqrt(1-x*x))=10^(8/20)
    (x-1)-(2x-1)=1x-3x
    2(y+2)-3(4y-1)=9(1-y)
    2(y+2)-3(4y-1)=9(1-y)
    2(y+2)-3(4y-1)=9(1-y)
    3(x-2)-2(4x-1)=11
    （5-t)t=24
    9x-2(-x+4)=3
    （12-2t）（16-2t）=96
    1/(2*x*sqrt(1-x*x))=10^(4.58/20)
    (x+0.5)^2=0.005
    X^2-11.6X+32.4=0
    85.305=（（0.021*x^1.85+955）^0.5）*x^1.84
    812=（（0.021*x^1.85+955）^0.5）*x^1.84
    10×0.3+10×0.3×0.95×0.99×0.3+10×0.3×0.95×0.99×0.32+....+10×0.3×0.95×0.99×0.3n-1=
    （5-x）:（3-x）=9:7
    X+X/15=600
    X+250+(X+250)/15=600

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