2X∧2+5X-18=0
    7000 = 3000（1-x）+4000（1+2x）（1-x）
    (x+2)^2=(3-x)^2+9
    (x+2)*(x+3)*(x+4)=120
    tan(x＋1)
    x*x＋37.33*x-3096＝0
    x*x＋0.3733*x-30.96＝0
    1.41*x*1.85*1.3=3.8
    cosx=sinx
    x＾3-0.5x+0.25
    （2+1/x）^x
    (55-x)（5-x）(5-x) =x×1.5×10^-5
    (55-x)（5-x）(5-x) =1.5×10^-5
    (55-x)（5-x）(5-x) =1.5×10^-5x
    (55-x)（5-x）(5-x) =1
    (55-x) =1
    (55-x) =1
    −8x2(x2+1)2+4(x2+1)
    −8x2(x2+1)2+20x(x2+1)2+4(x2+1)
    −8x2(x2+1)2+6x(x2+1)2+4(x2+1)

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