23.25 = arcsin(x/145)
    23.25=arcsin(x/145)
    （27.134+x）×2.75＝54.269+73.203-x
    （27.134+x）×2.75＝54.269+73.703-x
    40X-X²=300
    x²-7x+325＝0
    （80-x）（60-x）＝
    （80-x）（60-x）＝3500
    2x+3=0
    x²-5/2x+1＝0
    （x—25）（78—2x）=90
    10（x-3）+x=xx
    10（x+3）+x=xx
    x（x+8）=128
    2x∧2+4x
    3x- 1.3x+5x- 2.7x=-12×3-6×4
    (x-1)/2-(2x-1)/3=x+1
    x-1/2-2x-1/3=x+1
    5=5-3x
    X- 5=1

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