Mathematics 1, the expressway from Shanghai to Nanjing is 274 kilometers long. A car travels from Shanghai at a speed of 85 kilometers per hour 104 kilometers, and it takes 2 hours to reach Nanjing. (274= 104)/85=2.

2. Xiao Mahu first calculated the subtraction when calculating 250-()×7, and the result was 1575. Then the correct result of this question should be (75). 250-(25)*7=75

3. Pour the water into the empty bottle with a cup. If you pour 3 glasses of water, the weight of the water bottle is 440 grams. If you pour 5 glasses of water, the water bottle will weigh 600 grams. Think about it. A glass of water weighs 80 grams and an empty bottle weighs 200 grams.

(600-440)/(5-3) = 80g

440-80 * 3 = 200g