4年级数学应用题（The 4th grade math application problem）.doc

4年级数学应用题（The 4th grade math application problem） The school has an investment of 450,000 yuan and a real investment of 400,000 yuan. How much is the actual investment saved? (zhuji city, zhejiang province) 2. The school plans to use 480 degrees of electricity in May, which is actually less than 60 degrees. What is the actual electricity saving? (fujian yunxiao experimental primary school) 3. A factory planned to produce 400 sets of TV sets in March. In fact, it produced 250 units in half a month. It produced 230 units in the next half month. (qingyun district, nanchang city) 4. A, b, c three existing water pipe, a pipe flow out of 4 grams per second mixture containing 20% salt, b pipe flow out of 6 grams per second mixture containing 15% salt, c water flow out of the water, 10 g per second c tube began after 2 seconds, dont open the flow, then 5 seconds, and then stay up to 2 seconds, and then flow for 5 seconds... The three pipes are open at the same time. They are closed in one minute. What percentage of the mixture is in? (wuhan university foreign language school) 5. There are 75 classes of calligraphy and painting classes in xinguang primary school. There are 48 dancers in the class. (nanning city) 6. Xiaoming experimented with a packet of mung beans, of which the seeds of germination were 100 grains, and the seeds with no germination had 25 grains, and the germination rate of the green bean was found. (zhejiang wenling city) Look at 4 pages. How many times do you see the book the next day? (wuxi city, jiangsu province) 8. Donations for the disaster area, xiao hua donated 4.2 yuan, and she donated 0.4 yuan more than xiao lido. Xiao hua is a few more than little lido. (anyang, henan) A dress is sold for 100 yuan and sold for 90 yuan. What is the actual discount? (zhejiang xianju county) The canteen has shipped 600 kilograms of rice. It has been eating for four days and eats 50 kilos a day. How many kilograms do you eat every day for the rest of the five days? (ji