10000v=20000v
    x²-4x-3=0
    x^2+7x+1813=0
    38.44+116.76+275.02=33.22+61.79+181.83+x(74.34+13.07x)
    (250(10-x))/(200(10+x))=(10*(2.5-2.5x)/0.01)/(10*(4.8+2.5x)/0.04)
    (2500-250x)/(2000+200x)=(2500-2500x)/(1200+2500x)
    33X-10X=69
    66*(3X-10)=132
    2500-250x/2000+200x=2500-2500x/1200+2500x
    42*(13+X)=840
    lnx-x/e
    77x+x=154
    cosA=2/3
    cosA=2/3
    CosA=2/3
    x+72=500
    （90*0.3）-x＝0.15*(90-x)
    （90*0.3）-x＝0.15*(90-x)
    （90*0.3）-x＝0.2*(90-x)
    31.5-x＝0.2*(90-x)

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