Câu 2: Một hồ cá có 156 con cá chép và cá rô. Tính số cá mỗi loại, biết rằng số các rô nhiều hơn số cá chép là 34 con. Câu 3: Một cái sân vườn hình chữ nhật có trung bình cộng của chiều rộng và chiều dài là 15m, chiều rộng là 10m. Tính diện tích của sân vườn đó. Câu 4: Tính nhanh: 751 x 68 + 751 x 32 giup với ạ

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