Mathematics
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    2x^(2)-5x+2=0
    x(60-x)=864
    1.3^n=100
    5+6
    1/2
    2/1
    30000×(1+r)^-1+30000×(1+r)^-2+30000×(1+r)^-3+30000×(1+r)^-4+30000*(1+r)^-5+500000*(1+r)^-5=526730
    30000×(1+r)^-1+30000×(1+r)^-2+30000×(1+r)^-3+30000×(1+r)^-4+30000*(1+r)^-5+500000*(1+r)^5=526730
    700000*(1+r)^-5=397200
    40000×(1+r)^-1+40000×(1+r)^-2+40000×(1+r)^-3+40000×(1+r)^-4+40000(1+r)^-5+500000×(1+r)^-5=560000
    1925/0.7
    1925*0.7
    66+(13.7*83)+5*173-6.8*21
    8.15*π*a-180sin(a)=72*8.15*π
    8.15*3.14a-180sin(a)=72*8.15*3.14
    ln3:ln2
    ln3/ln2
    (x-2)+(x+2)+x/2+2x=45
    31*56
    (sqrt(472-57.6)-2)/3

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