2xx-5x+3=0
    3x（x-2）=x-2
    3x-50=850 4y=800
    3x-50=425 4y=425
    19492.33={x-468000}*12%
    2x^3-x^2=1
    h
    -x^2-10x+200
    Y=300+0.6×（Y-1000）+1000+1300
    (1+R)∧12-1＝10%
    -x^2-10*x+200
    (4/5）-(120/x)
    -X^2-10xX+200
    15x^2+2x-4=0
    15 ^2+（ 20-x）^2= （ 20-x）^2
    x*x+x-2
    x*x+x+2=0
    （80+x）(53-x)=51*80
    2x（30-2x）+2x（20-2x)=200
     x/sin(x/2) = 4.1887

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