a×0.6=19.9
    a×0.6=19.9
    a×0.6=16.9
    （x-40）[500-10(x-55)]=8000
    X^4-3X^2-2X
    （x-40）（x-55）=800
    （x-40）（x-55）=80
    k^3+3k-3k^2=63/64
    a×0.6=38.8
    a×0.6=28.8
    a×0.6=16.8
    a×0.6=10.8
    a×0.6=28.9
    sinx/x
    2x=x+3.14x
    16.56-x = 3.14x
    16.56-x=3.14x
    16.56-x=xπ
    23x+5=56
    a×0.6=21.9

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