x*1234233=1234233
    x-x^2=400
    (5+x)/0.3=(6.5+x)/0.4
    tanx=1/5.11
    tanx=0.2
    tanx=5.11
    x^2/e2
    8（1+x）²=18
    8（1+x）²=10
    s²+s+2=0
    [1.17%(1+1.17%)^3]/[(1+1.17%)^3-1]=X/50000
    [(1+1.17%)^3-1]/[1.17%(1+1.17%)^3]=50000/X
    x^3+3x+1=0
    x^2+1=0
    18.4×1800×x×(1644-x/2)=3923.379
    18.4×1800×x×(1644-x/2)=3923.379
    18.4×1800×x×(1644-x/2)=3923.379
    [（1+X）^3-1]/[X（1+X）^3]=50000/17597.19
    10/133.58+X/1000+（31.8-X）/1650=0.1
    9/133.58+X/1000+（37.8-X）/1650=0.1

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