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    t=(48-2)×100/92
    (1+r)*1+(1+r)^2*2+(1+r)^3*3+(1+r)^4*4+(1+r)^5*5=5.7614
    12.5=3.465×0.0001×50×50×X^2+1÷3×(3.465×0.0001)^3×50^4×X^4
    12.5=3.465×0.0001×50×50×X^2+1÷3×(3.465×0.0001)^3×50^4×X^4
    2y²+5y-18
    2.5=3.465×0.0001×50×50×X^2+1÷3×(3.465×0.0001)^3×50^4×X^4
    -4(y-2)(3y+7)
    2/x+1/(x+2)+1/(x+4)=1/(x+1)
    x^3+x^2-151*x/5+1=0
    x^3+x^2-149*x/5+1=0
    x^3-4x^2+16x+2=0
    x+1
    x^3-61x^2+510x-9=0
    10/89.14+4/133.58+4/50+14/200+X/1000+(65.3-X)/1650=0.346
    10/89.14+4/133.58+4/50+17/200+X/1000+(62.3-X)/1650=0.346
    10/89.14+4/133.58+4/50+16/200+X/1000+(63.3-X)/1650=0.346
    10/89.14+4/133.58+4/50+15/200+X/1000+(64.3-X)/1650=0.346
    10/89.14+4/133.58+4/50+10/200+X/1000+(69.3-X)/1650=0.346
    X-2=3-x
    10/89.14+4/133.58+4/50+20/200+X/1000+(59.3-X)/1650=0.346

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