2x=7
    0.058x^2-1.9x+1.56=0
    e-10k+e-7k+e-3k=0.15
    cotanx=10.2
    sqrt(3)x^2+3030x-sqrt(3)*10000=0
    1500*(1+x)^(-2)+1500*(1+x)^(-1)-2600=0
    X=1+2
    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

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