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cuongmoc97
2 năm trước
Cho tam giác MNP có góc M =90 độ, I là điểm nằm giữa N, P. a) Chứng minh MI bé hơn ít nhất một trong 2 cạnh góc vuông. b) Vẽ MH vuông góc với NP tại H . Trên cạn NP lấy điểm E sao cho NE = NM, trên cạnh MP lấy điểm F sao cho MF=MH. Chứng minh tam giác MHE = tam giác MFE . Chứng minh rằng trong một tam giác vuông tổng độ dài hai cạnh góc vuông nhỏ hơn tổng độ dài cạnh huyền và chiều cao tương ứng.
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