4372048867×0.1189+7425000×0.4627
    8772121*102598800232111471
    71*123551
    71*123551
    330×4909×(1150-50)
    1×14.3×1000×(1150-50)
    4372048867×01189+7425000×0.4627
    330×7854/(16.7×785398)
    4372048867×0.02739+7425000×0.1569
    330×7854/(16.7×785398)
    1×16.7×785398
    (2×9.3×10-9.3)/(2×9.3)
    0.994/0.386
    (2.74-1)/(1+0.751)
    (142.82×5.26+73.3×13.11)/359.45
    6-（1-6）
    4-（2-1）
    sin45 sin60
    sin45 sin60
    sin30

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