3x^2*（16-x）^2+4*21*21*x^2＝48*（16-x）^2
    x*x=4
    t^2+36t=144
    t^2+36t
    2^x-1/2^x+1
    2083.22*1000000=16.1*1600x(1176-x/2)
    x^3+3x^2+1=0
    x½
    3q＾2—4q—4=0
    4+16-x＾2=x＾2
    4+16-x＾＝x＾
    0.75=1/(2abs(x))+abs(x)/(2-x)
    0.75=1/2abs(x)+abs(x)/(2-x)
    n^ 2+n =4044
    340x²-344x+85＝0
    340x²-344x+85＝0
    700*x^3-1200*x^2+750*x+50=137.5
    x*1500-(600*x+400)-(1500*x*0.13-80*x)*0.09=0
    1-x^2=2.5-2(√10)x+4x^2
    3x-[1-(2-x)]=2

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