（1+4%/4）^4-1
    ln0.29
    ln0.75
    1-e-1
    1-e(-0.2)
    1-e(-1.5)
    1.0*(1.3*66.5)
    1.0*(1.3*66.5+1.5*4+1.5*0.7*2)
    0.28*24*7*1*√2
    0.28*24*5*1*√2
    C(3,2)
    A(3,2)
    !(5)
    6129÷78
    5003÷38
    1284÷9
    300÷37
    426÷18
    89÷14
    215÷12

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