sqrt(4.45（90-4.45)=
    -atan(0.6/2.77)-atan(0.6/4.77)-atan(0.6/(-1.23))
    14.16*（90/350)^0.16
    90^0.16
    350^0.16
    8000*1.0233^31
    ln(0.5*50+0.5*100)
    2×3
    070*04=
    50/（1+10%）+100/（1+10%）^2+150/（1+10%）^3-150=
    200/（1+10%）+800/（1+10%）^2-800/（1+10%）^3-200
    5.01-4.77
    arccos(-0.782852)
    0.9ln200
    ln150
    -0.211009/105
    -2.110092*0.1
    -2.3/(1+0.09)
     8/(1+0.12)+8/(1+0.12)^2+8/(1+0.12)^3+100/(1+0.12)^3
    ln(0.5*100+0.5*500)

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