99*89
    99*86
    (0.78+2.243*1.5^0.5)*0.7*(0.993+0.18*0.3-1.06*0.3^2+1.71*0.3^3)
    (0.933+0.18*0.3-1.06*0.3^2+1.71*0.3^3)*(0.78+2.243*1.5^0.5)
    18*19
    997*653
    98*56
    98*56
    99*99
    (1000－1)^2
    99*99
    78*89
    9999*9999
    （100－1)^2
    5429*937
    9999^2
    97*96
    999*999
    99*999
    987654*456789

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