Mathematics
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    (x-0.1)×100=200×(0.15-x)
    (x-10%)×100=200×(15%-x)
    2800乘(2+x乘x)=2800
    x*x*x*x*x-x*x*x=3
    5x-7*⅓等于0.9
    5x-7x⅓等于0.9
    20十2x=5x一44
    Tancos0.89-tancos0.91
    tanx=0.017211704
    1.01x=1213
    1.01x=1210
    X×0.7+20=94
    1.01x=1200
    5x-x²=6.25
    X+√3x/3=30
    x*93%+x*93%*5%=7500000
    x*93+x*93%*5%=7500000
    (X-74.3)/X=0.3
    n+n^2+n^3+n^4=0.8
    n+n^2+n^3+n^4=1.6/2

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