（180+x）（60-x÷10）=14000
    （140+x）（60-x÷10）=14000
    3y^2-56y+48=0
    429/(2711*0.562/1.8) = 794/(794-54+x)
    3（1+X）（1+X）=6.75
    429/(2711*0.562/1.2/2)=794/(794-54+x)
    429/(2711*0.562/1.2)=794/(794-54+x)
    592/(x+592)=0.3841
    x(x+12)=864
    40(1+x)^2=39.5
    40x^2+120x-70=0
    m²+12m-29=0
    m²+12m-20=0
    849*((1+x)^6-1)/((1+x)^6*x)=5000
    x（20-x）+x（16-x）=68
    （20-x）（16-x）=68
    1+x+x²=43
    1+x+x（x+1）=43
    1+x+（x+1）=43
    （50+x）（500-10x）=8750

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