√5*0.535898((2-2*0.535898)^2+0.535898^2)
    x+(8700-x）=8700
    25+45/8-9/8
    64^(-2/3)
    64^(2/3)
    √3+√11
    0.30*x+790*6=0.34*x+1900
    x=(1.348683/2.181139)^-1.6
    x=(1.348683/2.181139)^-0.4
    x=(1.348683/2.181139)^-2
    x=0.4^-0.5+0.6
    x=0.4^-0.5*0.6+0.4
    100(1-4*0.06)^-1/2
    100(1-4*0.06)^-1/4*2
    499392-379128-13269-92042
    -103680-(30701.5/1.054+32613.8/1.054^2)
    -103680-(30701.5/1.054+32613.8/1.054^2)+x/1.054^2=-79314
    e3+3e2－9e－27=0
    (2×10×((sinx+20)+(sinx-20))÷(19×(1-(cosx-20)))=
    3.4=((2×10×sin（x+20）×sin(x-20))÷(19×(1-cos(x-20)))

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