（40.221+x）×0.85＝40.221+69.242-x
    （40.221+x）×0.85＝40.221+70.242-x
    （40.221+x）×0.85＝40.221+71.242-x
    （40.221+x）×0.85＝40.221+72.242-x
    8:5➕X =10．2
    17500/（x+12.12）+7500/x＝150
    17500/（x+12.12）+10000/x＝150
    （40/x+8.5）/（50/x+6.8）=0.507/0.493
    a=arccos(a)
    a=arccos（a）+sin(a)
    27-3p-3
    27-3p+8
    （a＋1)5＝3
    14X+X^2=24
    x^3+3x-1＝0
    14X+X^2=24
    2/3/c＝5/6
    （-x+1）²
    （-x+1）²
    （-x+1）²

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