0.85*11
    20000^(-0.5)*600^(-0.5)
    20000^(-0.5)*600*(-0.5)
    19.6078*（x-153）/x = 2
    1.16*3
    1.16*1.2
    130/(1+0.1)+130/(1+0.1)^2+130/(1+0.1)^3+130/(1+0.1)^4+1000/(1+0.1)^4
    （5000×12×0.9－70%×51X×6.4%）÷（30%×51X+5%×51X） = 3.8%
    2019/（2020-1/2020）+1/2020
    0.9*(1.0*3.1*20.5+2.0*0.0413*1.052*300)*21752
    1.3*1.0*3.1*20.5*21752
    3.5-0.45+3.5
    740*383.08*383.08-650*（383.08-120）*（383.08-120）
    (1480×〖203.77〗^3)/3-((1480-180)(203.77-120)^3)/3+6.67×4820×(1018-203.77)^2
    (1/2×180×1100^2+1/2(1480-180)×120^2+(6.67-1)×4820×1018)/381329.4
    180×1100+(1480-180)×120+(6.67-1)×4820
    (1480×213.16^3)/3-((1480-180)(216.16-120)^3)/3+6.67×4820×(1018-213.16)^2
    56Q-(580+40Q)-(56Q*13%-5Q)*12%=0
    3.5+10.88-18.74
    2*(-9.37)

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