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2 năm trước
cho thửa ruộng đáy bé g hình thang có đáy bé là 42cm, đáy lớn = 1,5 lần đáy bé, chiều cao = trung bình cộng 2 đáy. hỏi : a) tính dt hình thang b) ng ta cấy lúa trên thửa ruộng hình thang này, cứ 100m2 thu đc 60 kg thóc . hỏi cả thửa ruộng thu hoạch đc bao nhiêu tạ thóc
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