0.85*43x+0.15*15x=16521*0.53
    0.85*40x+0.15*15x=16521*0.53
    0.85*43x+0.15*15x=12576*0.53
    0.85*40x+0.15*15x=12576*0.53
    0.85*41x+0.15*15x=12576*0.53
    0.85*41x+0.15*15x=12576
    0×4+36
    10+3+9*4
    2+0+5+0
    （y-1）+（y+5）
    2-[-x^2-3x-2]^2
    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

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