(1.5*40%)/3%=
    (35%-5%)/1.6=
    (35%-5%)*1.6=
    1/10+1/5+3/10+2/5
    1*1.8/2-1=
    (1-12.5%)*2.2/2-1=
    200×25
    48乘以16
    48÷16
    90÷39
    63÷18
    85÷41
    96÷32
    806÷80
    5400÷36
    5400÷40
    270÷18
    540÷18
    1360÷17
    680÷17

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