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    x^2+170x-2025
    -(20-x)(40+x)-900=0
    2x/x^2-3x^2/x=2
    -3 = e^x * e^6 + 1
    x=atan1 3.14/((ln5.1176)/3.14)
    5n^2=(3n-8)^2+(2n-4)^2
    15*x-5*x^3=1
    1/(d+1)+1/(d+2)+1/(d+2)=1/(d+3)
    0=-2.4*10^(-11)*x^3+4.6585*10^(-7)*x^2-1.00253*x+8.1828
    [(1-3m)/5]^2+[(3m-1)/10]^2=[(3m-1)/2]^2+(m+1)^2
    2(cosx)^2-3^(1/2)sin2x=-1
    2(cosx)^2-3^(1/2)sin2x=1
    2-x≥0
    100×4x+200x=(100+200)×12%
    300×(10+X)=350×(5+X)
    100+4x+200x=(100+200)×12%
    x+100??300
    ??????????????[CQ:face,id=178][CQ:face,id=178]
    x+100??300
    4[(14n-70)/5]^2+4(5-n)^2=[(14n-140)/5]^2+(10-n)^2

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