（200000-1）/400000
    5.16%*3132/(3132+90000)
    8.26%*90000/(90000+3132)
    8.26%*90000/(90000+3132)+4.64%*3132/(3132+90000)
    arcsin0.69
    8.26%*90000/(90000+3132)+6.3%*3132/(3132+90000)
    555+666=
    48＋1.2×5
    5×3＋1.2×5
    4^35
    2%3
    5÷5/9+5÷4/9
    508/63
    410/82
    72/33
    68/21
    708/91
    326/73
    176/22
    84/42

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