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plnamanh
2 năm trước
Cho tam giác ABC d thuộc tia đối AB, E thuộc tia đối AC sao cho AD =AC, AE = AB,AH vuông góc BC, AK vuông góc DE chứng minh rằng a) tam giác ABC=tam giác ADE b) BH=EK c)góc HAC=góc DAK
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