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viksqt123
2 năm trước
1. Một đám ruộng hình thang có đáy lớn là 34,6m, đáy bé 21,5m, . Người ta kéo dài đáy lớn hình thang thêm 4,8m nữa thì diện tích tăng thêm 43,2m2. Tính : a/ Diện tích đám ruộng ban đầu. b/ Người ta trồng lúa trên đám ruộng ( sau khi tăng thêm diện tích ), trung bình cứ 100m2 thu hoạch được 60 kg thóc. Hỏi đám ruộng thu được bao nhiêu tấn thóc? 2. Một bể cá hình hộp chữ nhật có chiều dài 1,5m, chiều rộng bằng 2/3 chiều dài, chiều cao 0,5m. Tính thể tích nước trong bể biết chiều cao mực nước bằng 3/4 chiều cao của bể ?
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