0.55+4.3×0.2=
    3.78+0.49×0.2=
    0.0038×7.528×2.7^2+0.0174×2.25×2.7^2=
    0.04×7.528×2.7^2+0.0965×2.25×2.7^2=
    -0.0569×9.03×3.9^2
    -0.0832×9.03×3.9^2=
    1.53+7.08×0.2=
    7.08+1.53×0.2=
    0.0091×7.153×3.9^2+0.0188×1.875×3.9^2
    0.0405×7.153×3.9^2+0.0936×1.875×3.9^2
    30/(1+10%)^5+30/(1+10%)^4+30/(1+10%)^3+90/(1+10%)^2+90/(1+10%)-200
    90/(1+10%)^5+90/(1+10%)^4+30/(1+10%)^3+30/(1+10%)^2+30/(1+10%)-200
    40/(1+10%)^5+40/(1+10%)^4+60/(1+10%)^3+80/(1+10%)^2+80/(1+10%)-200
    40/(1+10%)^5+40/(1+10%)^4+60/(1+10%)^3+80/(1+10%)^2+80/(1+10%)
    0.3/(1+0.58)×（0.42-0.1）×5.01×10×10^(-3)×42
    arccos(155/160)
    arccos ((37+118)×2)/(2×160)
    (76.37×cos14)/2
    2×138901/48.29
    (π×48.29×75.87)/(60×1000)

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