1)tinh so hoc sinh cua mot to biet co 120 cach xep hoc sinh to do thanh mot hang doc.
2)mot to co 16 hoc sinh 8 nam 8 nu . co bao nhieu cach sap xep 16 hoc sinh do thanh mot hang doc.
3)cho hai duong thang song song d1, d2. tren d1 co 10 diem phan biet, tren d2 co n diem phan biet (n>1). biet co 2800 tam giac co dinh la cac diem da cho. tim n.
4)cho tam giac ABC tren canh AB lay n diem tren canh BC lay m diem tren canh CA lay k diem khong trung voi ba dinh A,B,C. hoi co bao nhieu tam giac voi dinh la cac diem do.

Câu hỏi này được treo giải thưởng trị giá +1000 vỏ sò bởi vanthanh9e@gmail.com, đã hết hạn vào lúc 11-11-16 06:46 AM

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