23.5×a×0.5+3=5.1
    7.8×a×0.55+3=5.6
    x2-145x+3375=0
    x^2*ex+lnx=0
    x+1=0
    (1/3)*X-(1/10)X*(100-X)=16
    X- 2/5等于2
    X- 2/5=2
    X- 2/5=2
    arctanx+arctan(0.2*x)=90
    ex=1/2x+1
    1500+200x=600+800x
    1500+200x=600+80x
    1500+200x=500x
    4000/1.6x－4000/ x＝30
    0.7×40x＝0.8×40×（x－6）
    4^x+5^x=9^x
    4^x+6^x=9^x
    330/（x＋30）＝240/x
    330/x＋30＝240/x

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