（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
    (7-x)(7-x)(7+x)=512÷3÷π
    1.56=lnB+0.532*ln0.158
    0.812=lnB-0.535*ln25
    0.712=lnB-0.535*ln30

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