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hoangvy11001
2 năm trước
1 tính dt hình thang có đáy lớn 54m ,đáy bé bằng 2/3 đáy lớn và bằng 3/2 chiều cao. 2 tính dt hình thang có đáy lớn bằng 25m ,chiều cao bằng 80% đáy lớn . đáy bé băng 90% chiều cao.
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