a-sin(a)*cos(a)=0.785
    (30+7m)*180*{1.8*(1-0.1m)}+{80-(30+7m)}*120{1.5*(1-0.05m)}=18720
    3*x^4-2*3.67875*x^2-1=0
    x-2=1
    168.0515+0.0542726x=167.7992+(x-7)/4
    9/7+y-5=0
    7+X=19
    x^2+（4*√2-4）*x-（8√2-4）=0
    a-sin(a)*cos(a)=0.157
    168.0515+0.0542726x=168.2092-x*0.06
    7*x-9=0
    x+3*（-1）=-1
    xx-3x=-2
    168.0515-0.0542726x=168.5192-(x-7)/4
    (30+7m)*{1.8*(1-0.1m)}+{80-(30+7m)}*{1.5*(1-0.05m)}=18720
    x（180*1.8）+（80-x）（120*1.5）=18720
    3x+9=-3
    （30+7m）*{1.8（1-0.1m)}+{80-(30+7m)}*{1.5(1-0.05m)}=18720
    （30+7m）*{1.8（1+0.1m)}+{80-(30+7m)}*{1.5(1-0.05m)}=18720
    2x^4-4x^3-7x^2+9=0

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