禁忌之痕腰带剑豪:利用因式分解计算:83*77
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83*77
(80+3)*(80-3)=80^2-3^2=6391
(80+3)*(80-3)=80^2-3^2=6391
83*77
=(80+3)*77
=80*77+3*77
=6160+231
=6391
(80+3)*(80-3)=80^2-3^2=6391
(80+3)*(80-3)=80^2-3^2=6391
83*77
=(80+3)*77
=80*77+3*77
=6160+231
=6391