77x77+23x23简便方法
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77x77+23x23
=77x(100-23)+23x23
=77x100-77x23+23x23
=77x100-23x(77-23)
=77x100-(23x30+23x4)
=7700-(690+92)
=7700-700-82
=6918
=77x(100-23)+23x23
=77x100-77x23+23x23
=77x100-23x(77-23)
=77x100-(23x30+23x4)
=7700-(690+92)
=7700-700-82
=6918
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