x = (x+85200)/1.06*0.06*1.12
    x = (x+85200)/1.06*0.06*1.12
    x = (x+85200)/1.06*0.06*1.12
    x = (x+85200)/1.06*0.06*1.12
    x = (x+85200)/1.06*0.06*1.12
    x = (x+85200)/1.06*0.06*1.12
    x = (x+85200)/1.06*0.06*1.12
    x = (x+12000)/1.06*0.06*1.12
    x=(x+272000)/1.06*0.06*1.12
    3x+24=5x+23
    80/(1+x%)+80/(1+x%)^2+80/(1+x%)^3+1080/(1+x%)^4=1107
    tanx
    tanx
    256w^4+68w^2-3=0
    （X-180）*（1-25%）/1500=（X-180-320）*（1-25%）/1000
    （x-1）∧4
    x^x=x^22
    0.6*（1+x）/12+x
    （12424-X）/X=0.7
    (x-180)x(1-25%)÷1500=(x-180-4000x8%)x(1-25%)÷1000

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