(x-5)(850-50x)=1600
     (40-y-25)(400+5y)=4250
    256(1+x)²=400
     (480-x-360)(160+2x)=20000
    (480-x-360)(160+2x)=0
    x²-40x+8800=0
    a×0.6=96.9
    a×0.6=56.9
    a×0.6=38.9
    a×0.6=26.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    a×0.6=11.9
    lnk=-0.585

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