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19 tháng 11 2017

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20 tháng 11 2016

Nếu ta nối 1 điềm với 14 điểm còn lại thì sẽ có tất cả:15 x 14 =210 đường.

Nhưng nếu ta nối vậy thì mỗi đường sẽ lặp lại 2 lần,nên thực tế nối được:210:2=105 đường

                                                         Đ/S:105 đg

k mk nhen

20 tháng 11 2016

ĐS  28 hình dán