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
    13=9×（b/255）
    13=9×b/255
    1.5x+4000-x＝4500
    （x-7）（x+6）=32
    （x-7）（x+6）=32
    sinx=7.7

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