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chaucuho7
2 năm trước
Tìm x 15,6 - x = 8,49 2/ một bể kính nuôi cá dạng hình hộp chữ nhật có dài 80 cm , rộng 60 cm , cao 70 cm . Bể ko nắp . Tính : a) diện tích kính dùng làm bể B) thể tích bể
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