(1.21×9.8×3.5)/(4×0.82)
    (31.2+0.87)/4+(4.65×2.65)/(2.675×2.675×4)+(5.57×3.2)/(3.2×3.2×4)
    88400:44
    88:44
    88400:44
    22.9/2.1%
    88.4/4.4%
    88.4/4.4%/22.9/2.1%
    88.4/4.4%/22.9/2.1%
    9.5+0.2+0.64+7.3
    1020236528*45263598781=
    1020236528*45263598781=
    1/2*4√6*2√2
    (tanarccos0.77-tanarccos0.93)
    (tanarccos0.89-tanarccos0.91)
    (tanarccos0.89-tanarccos0.92)
    tanarccos0.89-tanarccos0.92
    660.35√(1.3*2.58*100000*4.78÷20÷39.34÷39.34÷3.79)
     3.54*189.8*√cos(15)*√(1.3*2.58*100000*4.78÷20÷39.34÷39.34÷3.79)
    ［1748×（1+0.0574）×1.1255×1.1028+0］×0.9914

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