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123456ha
2 năm trước
Cho tam giác ABC vuông tại A, có AB= 15cm. AC=20cm, kẻ đường cao AH a) Tính BC, AH b) Gọi D là điểm đối xứng của B qua H. Vẽ hình bình hành ADCE, chứng minh ABCE là hình thang cân c) Tính diện tích hình thang cân ABCE
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