2666.7×0.99
    66666.7×0.01
    66666.7×0.99
    sqrt（9）
    sqrt（9）
    ln15
    ln3+ln5
    (50695.4+60614.4)/(23839.2+43191.2+4300)
    830.6×2×2.6×10=
    191:395
    1+2
    5.229471÷3×1.85-3.1415926×0.19^2×1.85
    1.512^2+1.05^2+√(1.512^2+1.05^2)
    4.120572-3.1415926*0.19^2*2.35
    4.120572-3.1415926*0.19^2^2.35
    5.260304/3*2.35
    1.52^2+1.05^2+√(1.52^2+1.05^2)
    (10*16000+15*9000)/(50*16000+60*9000)
    10*16000+15*9000/(50*16000+60*9000)
    4.48097-（3.14*0.185^2*2.5）

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