16^2-4*（-48）
    -5+9
    16/15+162.5%
    16/15+162.5/100=
    64÷3
    （1+4%）²-1
    64÷3
    64÷3
    64÷5
    70÷5
    √15
    1496*0.9*0.8-536*（0.9-0.3）*2-325=
    1496*0.8*0.8-536*（0.8-0.3）*2-325=
    1496*0.8*0.8-536*（0.8-0.3）*2=
    arctan(π/4)-arctan(-π/4)
    arctan(π/4)-arctan(-π/4)
    arctan(π/4)
    sinπ/4
    arctan0
    arctan0

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