21*(30＋2)
    36＋24
    85*63
    9999*9999
    999^2
    98*89
    97*86
    66*88
    99*99
    21*32
    12*12
    234*78
    99*99
    (100－1)^2
    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

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