X+0.1X=1450
    X+0.1X+49=1450
    x^x = -1
    x^x = -1
    X+0.1X=1450
    x*0.0017=722
    x*0.17=722
    x = 150 - 150 * sin(45)
    x = 150-150*cos(60)
    (-1)^x = 5
    x=150-150*sin(60)
    x=sin(30)
    x = sin30
    x=sin(30)
    x=cos(60)
    x=150-150*cos(60)
    x*0.5＝199
    -1/5x+x
    800+x^2等于80x
    2x^2-3+x=0

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