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
    -x^2/(90000000000000000*sqrt(1 - x^2/90000000000000000)) + sqrt(1 - x^2/90000000000000000)=0
    2800*[x*(1+x)^30/(1+30)^30-1]=200
    2*c^3-3*c^2-12*c+20=0
    200×T=300×T-600
    7600/(x+101*0.12)+15100/x=150
    7600/(x+105*0.12)+15100/x=150
    7600/(x+101*0.12)+17600/x=150
    3600/(x+101*0.12)+20000/x=150
    7600/(x+101*0.12)+17600/x=150
    7600/(x+101*0.12)+15100/x=150

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