D=12.7×0.54
    D=12.7/sin(180/30）
    22037.45+83531.918+37156.6x+463.775x+616.31x+216000=3916206.6+1383100+11445.1x+528921.6+1568986.31+(22037.45+83531.918+37157.6x+463.775x+616.31x+216000)(0.0667+0.25+0.10)
    11605.043+37337.630+37156.6x+463.775x+616.31x+216000=2126060.352+751187.15+11445.1x+528921.6+814424.952+(116050.43+37337.630+37156.6x+463.775+616.31x+216000)(6.67%+25%+5%)
    400*64.3-400*x=150*165.3-150*x
    116050.43+37337.630+37156.6x+463.775x+616.31x+216000=2126060.352+751187.15+11445.1x+528921.6+814424.952+(116050.43+37337.630+37156.6x+463.775+616.31x+216000)(6.67%+25%+5%)
    x/21.75*12+x+1.2x=5800
    x+0.3x＝1000
    116050.43+37337.630+37156.6x+463.775+616.31x+216000=2126060.352+751187.15+11445.1x+528921.6+814424.952+(116050.43+37337.630+37156.6x+463.775+616.31x+216000)(6.67%+25%+5%)
    3100/x^2=5.7x+114.7
    x+0.3x＝1023
    0.3x+x＝1020
    0.00887x^2+0.1266x+1=0
    x-[(x-800)*0.2]=70000
    a^4+a^3+a^2+a+1=0
    x-{（x-5000*9）*0.10-2520}=148500
    x-{（x-5000*9）*10-2520}=148500
    50000=30000（1+x）^4
    2x^2+7x-4=0
    Y=100+0.9Y+50

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