2.554432-0.16*1.554432
    2.7664-0.2*0.6*1.7664
    2.92-0.08*1.92
    35%*x=5%*x+30000
    0.6X/30+X=60％
    √[1-（abs（x）-1）^2]
    0.5*6.28*(50.625*10.9+72.308*9.2)+3.14*0.775*0.65*[364.338+2.5*(211.089+20.155*9.2)/(10.9+9.2)*(14.5+9.2-3)]
    0.5*6.28*(50.625*10.9+72.308*20.1)+3.14*0.775*0.65*[364.338+2.5*(211.089+20.155*20.1)/(10.9+20.1)*(14.5+20.1-3)]
    arctan(300/w)-arctan(40/w)＝-9.847
    arctan(300÷x)－arctan(40÷x)＝－9.874
    374/216
    216/374
    1.8+0.4x=x
    1.8+0.6x=x
    1.5+0.6x=x
    1.5+1.5x=x
    1.7+0.6x=x
    x/0.2=36
    (sqrt6)/3
    2/(sqrt6)

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