... hon 10, ta nhan dugc 83 > 20 . Tu 82 > 10 va 83 > 20 ta nhan dugc a^ > 30, 35 > 50, ag > 80 va ay > 130 . Dieu ay > 130 la mau thuan voi gia thiet cac do dai nho hon 100 . ... ta phai quy tron so a = 2,235 den hang phan tram suy ra a * 2,24 . b) Ta CO 100 < 101 < 100 0 nen hang cao nhat ma d nho hon mot don vi ciia hang do la hang nghin ... do B = C. Vay tarn giac ABC can tai A. Bai 1.20: Cho 7 doan thSng c6 do dai Ion hon 10 va nho hon 100 . Chung minh rang luon tim dugc 3 doan de c6 the ghep thanh mgt tarn giac. Huang...