2(5+x)=50+88.2+212-2x
    2(5+x+22)=70+212-2x
    2(5+x+12)=50+212-2x
    0.5*（1-0.5^n）/0.5＝1
    2(5+x)=50+212-2x
    2(5+x)=50+212-2x
    tana0.14
    tana0.14
    （8301.5+10.35+65+X）*3.5%*1/4=X
    58.4+2x=50+216-2x
    x*（1+10%）²=
    X^3-2.41×211.8153^2-（27.08-8.45×0.0001×211.8153^2）×X^2=0
    x^3-6x^2+9x
    3n²+n=4734
    0.9*12*（81602+54337）*x+52033*0.9*12*（x+1）=6100270
    0.8*12*（81602+54337）*x+52033*0.8*12*（x+1）=6100270
    210+90x=150x+90
    0.7*12*（81602+54337）*x+52033*0.7*12*（x+1）=6100270
    0.7*（81602+54337）*x+52033*0.7*（x+1）=6100270
    95157.3x+36423.1（x+1）-6100270=0

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