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Cuongho000
2 năm trước
Một khu vườn hình chữ nhật có chu vi là 60m.Nếu chiều dài của khu vườn tăng thêm 5m và chiều rộng giảm đi 2m thì chiều dài mới bằng 2 lần chiều rộng mới . Hỏi chiều dài và chiều rộng lúc ban đầu. Bài 2: Hai xí nghiệp theo kế hoạch phải làm tổng cộng 360 dụng cụ.Nhờ sắp xếp hợp lí dây chuyền sản xuất nên xí nghiệp 1 đã vượt mức 12% kế hoạch, xí nghiệp 2 vượt mức 10% kế hoạch, do đó cả hai xí nghiệp đã làm được 400 dụng cụ.Tính số dụng cụ mỗi xí nghiệp phải làm theo kế hoạch. CẢ HAI BÀI ĐỀU DÙNG HỆ PHƯƠNG TRÌNH ,GỌI ẨN X VÀ Y NHÉ.!!!!!!
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