90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=100/(1+x)^1+190.7029/(1+x)^2
    90.7029=100/(1+x)^1+100/(1+x)^2
    90.7029=100/(1+x)^1+100/(1+x)^2
    90.7029=100/(1+x)^1+100/(1+x)^2
    4x^2+x-24=0
    0.6+20％x=15.6
    4x^2+7x-24
    4x^2+7x-24
    25-4*(3+2k)=0
    x^2-5*x+4=0
    x^2-x+4=0
    2y+6/y+0.2y+0.6=2.4

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