78*78/79的简便计算
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78*78/79的简便计算
78*78/79的简便计算
78*78/79的简便计算
78*78/79
=(79-1)(79-1)/79
=79^2-2*79+1/79
=79-2+1/79
=77+1/79
=77又1/79
78*78/79的简便计算
78*78/79的简便计算
78*78/79的简便计算
78*78/79
=(79-1)(79-1)/79
=79^2-2*79+1/79
=79-2+1/79
=77+1/79
=77又1/79