4400/x+10000/(x+22.4)+10000/x＝150
    4400/x+20000/(x+22.4)＝150
    8400/x+20000/(x+22.4)＝150
    48÷6x=8
    sin（x）=0.25
    sin（x）=0.25
    e^x=1/x
    sinx=cossinx
    x+4+20+15%x+（x+15%x）*13%=2600
    x^3-x^2-2
    x^3-x^2-2
    3x（x-1）=2-2x
    2x（x-1）=2-2x
    k/2=2 k/10=18
    k/-10=2
    k/2-10=2
    -2/(x-10)
    -2^x
    80-(x+2)/3=76
    3^x=x^9

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