sqrt(sqrt(4*0.404^4+1)-(2*0.404^2))*10.9
    sqrt(sqrt(4*0.404^4+1)-(2*0.404^2))
    -90-arctan(0.2*11.18)
    -90-arctan0.2*11.18
    2.86*13.98
    -40/13.98
    20lg5
    20lg10
    1/0.2
    710.9813*8.231^2 - 3524.3505*8.231+ 4978.3822
    710.9813*7.717^2 - 3524.3505*7.717+ 4978.3822
    710.9813*7.202^2 - 3524.3505*7.202+ 4978.3822
    710.9813*6.688^2 - 3524.3505*6.688+ 4978.3822
    (10+5)÷5＝
    (10+2)÷5＝
    20lg5
    0.1103*6.892^2 - 1.9454*6.892+ 17.504
    arctan(2*0.404/sqrt(sqrt(4*0.404^4+1)-(2*0.404^2)))
    e(3)
    2003*3^3 - 8312.9*3^2 + 13567*3 - 6806.4

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