(700×7×3.5+632×7×30.5+4×493×7×246.5)/(700×7+632×7+4×493×7)
    100000000000^0.3
    10000000000^0.3
    1000000000^0.3
    100000000^0.3
    10000000^0.3
    arctan(sqrt2)
    arctan0.5
    √42.25
    1.2*1.91
    3.14*1.2^2/4*(0.3+0.8)+3.14*0.285^2/4*10.5
    (24-0.3-0.8)*11/24
    (0.677×9.1×〖1.2〗^4)/(100×9000×8.333×10^(-6) )
    1.5×8.7/0.01×10^(-3)
    1.74/(1.667×10^(-1) )
    0.6×12.1×1.2
    0.6×12.1×1.2
    0.6×12.1×1.2
    0.1×12.1×〖1.2〗^2
    1.1×[1.3×(1.32×26+0.135+0.45）+1.5×（2.5+2+2)]×0.2

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