980÷28
    980÷25
    594÷25
    496÷87
    742÷20
    686÷54
    0.888*7*36.017+0.888*7*14.259
    2.47*(8*37.13+235*3.335)+2.47*(11*15.072+88*3.635)
    2.47*(8*37.13+235*3.335+11*15.072+88*3.635)+0.888*(7*36.017+7*14.259)
    16*12.513*4.83+16*12.246*4.83+16*6.4*4.83+32*5.31*4.83+32*3.4*4.83+10*13.576*0.888+10*12.763*0.888+186*5.183*0.888
    (3+4)*5.3-2*(5-3.2)
    （12，54）
    arctan7.627030721921611
    arcsin(sqrt(15)/4)
    0.7-0.3*(53/42)
    (7/10)-(3/10)*(53/42)
    1.49+0.23-0.46
    0.42*21/19
    2.577+0.238
    3.4288/2.101

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