（7x）x（7x）x（7x）=48
    (7)x(7)x(7)
    7x7x7=48
    7x7x7x=48
    7x7x7=48
    37×x＋63×x＝2800
    x/2lnx
    1.5除以x =10
    arctanx＝22.5
    arctanx＝45
    543000x＝0.363970
    arctanx＝20
    x^3－6x^2＋8x－16＝0
    x^3－6x^2＋8x－16＝0
    x＾3－6＾2²＋8x－16＝0
    lgx=-0.15
    11.8692/（11.8692-x）=1.998
    11.5896/（11.5896-x）=1.998
    22/（22-x）=2
    22/（12-x）=2

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