2（-9/5+3）
    627.65+8.5+3.5+2.8+2.5+2-2.6+8.6+7.3+8.7=
    2/3÷2
    sin45+cos45+tan45
    cossin45
    ½+⅓
    3.82×0.6÷3.82×0.6
    3.82*0.6/3.82*0.6
    arcsin0.5357
    arccos0.5357
    2^3
    20lg0.03773
    [11*sqrt(50^2*4^2+1)]/[1*sqrt(4^2+1)*sqrt(1+1/16*4^2)*sqrt(1+2500^2*4^2)]
    20lg0.150949
    [11*sqrt(50^2*1^2+1)]/[1*sqrt(1^2+1)*sqrt(1+1/16*1^2)*sqrt(1+2500^2*1^2)]
    20lg15.550134
    [11*sqrt(50^2*0.02^2+1)]/[0.02*sqrt(0.02^2+1)*sqrt(1+1/16*0.02^2)*sqrt(1+2500^2*0.02^2)]
    20lg19438
    [11*sqrt(50^2*0.0004^2+1)]/[0.0004*sqrt(0.0004^2+1)*sqrt(1+1/16*0.0004^2)*sqrt(1+2500^2*0.0004^2)]
    1321003963011889035667107*757

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