45×0.5-（45×0.15）=
    45×0.5×0.85=
    45×0.5-6.8=
    45×0.45-6.8=
    45×0.4=
    15×0.4=
    29.7×0.4=
    29.7×0.85×0.4=
    16.5×0.85×0.4=
    70/1.05+70/(1.05^2)+70/(1.05^3)+70/(1.05^4)-200/1.05^0
    70/1.05+70/(1.05^2)+70/(1.05^3)+70/(1.05^4)-200
    25÷√2
    arccos2^-1/2
    arctan(0.001×165)=
    arctan(0.1×165)=
    arctan(0.1×84.1)=
    arctan(0.001×84.1)=
    arctan(0.04×20)=
    arctan(0.1×165)=
    arctan(0.001×165)=

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