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nguyenvananh310897
2 năm trước
Cho tam giác ABC vuông tại A, đg cao AH với H thuộc BC biết HB =4cm ,HC=9cm .gọi I lần lượt là hình chiếu của H lên AB và AC a, tứ giác IHK là hình CN b, tam giác AKI đồng dạng tam giác ABC c, tính s của tam giác ABC
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