-1140+x-x*0.02=500
    0.65*（1-q^7）*（1-q）=6.79
    0.65*（1-q^7）/（1-q）=5.88
    4x^2+13x-162=0
    x/3+2/3x
    10x^2-4x=36
    3^x=x^9
    192*0.5*x-162*0.5*(x-15.5)^2-15*113.75*(181.2-x)
    192*0.5*x-162*0.5*(x-15.5)^2=15*113.75*(181.2-x)
    X+3÷x
    cosx÷（e＾x）
    x^2-24x+48= 0
    11000-P=(15000-P)*0.3571/1.05
    (15000-P)*0.3571/1.05+(15000-P)*0.6429/1.05=11000-P
    11000-P=(15000-P)*0.3571/1.05
    26-x+19=15-x+30
    4x^2-463x+6300＝0
    5*(5sinx+4)*(4cosx+1)
    102x+4x²=159.5
    x^2+2x=15

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