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thai26082004kcr
2 năm trước
b) Cho 5 đoạn thẳng có đo dài từ 10cm đến 45 cm. Chứmg minh rằng: luôn chọn được 3 đoạn thẳng trong 5 đoạn thắng đã cho lập thành 3 cạnh của một tam giác. :VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
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