2.182=lnx
    X^2-X=15750
    （112%－36%）×5000×g－5000×（1＋g）×8%×（1－50%）
    （112%－36%）×5000×g－5000×（1＋g）×8%×（1－50%）＝0
    （112%－36%）×5000×g－5000×（1＋g）×8%×（1－50%）＝0
    11%=0.6×（1+x）/［12×（1-6%）］+x
    X+1820/890X=48140
    X+1820/890=48140
    （40.221+x）×1.55＝40.221+71.242-x
    （40.221+x）×1.75＝40.221+71.242-x
    （40.221+x）×1.95＝40.221+71.242-x
    （40.221+x）×1.95＝40.221+72.242-x
    （40.221+x）×1.75＝40.221+72.242-x
    （40.221+x）×1.55＝40.221+72.242-x
    sinx-cosx+1
    ln(x)=9.809209752
    160x-x^2+7200=0
    -2t^3+5t^2-4t+2
    35x^2-98x+56=0
    (x-1)²+1.5²=(x-0.5)²

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