x^3+1.331+2.2x=0
    x^2-21/2x+5=0
    （x-58049.36-21742.42）/x=0.186
    (x-58049.36)/x=0.186
    (x-29437.64)/x=0.1935
     x-x*0.065-(x+1145872.48）*0.0003 = 1145872.48
    50sqrt(25/4-x^2)-32x+145=0
    x-x*0.065-(x+2311852.51）*0.0003=2311852.51
    x-x*0.065-(x+1145872.48）*0.0003=1145872.48
    -(6/7.55)^x=ln(0.9)
    2x^2=121^2
    4000/x=4000/(x+1)+200
    （0.6-0.15）-[（1+X）/X]*0.05
    （2000/x+1）*2-100=（2000/(x+1)+1）*2+100
    x+x*0.06=1500
    X-X*0.006=8.95
    sin x * tan x
    x+680x/2080＝25
    2800*[x*(1+x)^30/(1+30)^30-1]=100
    -x^2/(90000000000000000*sqrt(1 - x^2/90000000000000000)) + sqrt(1 - x^2/90000000000000000)=10000

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