1 drop half the weight of ice every hour, five hours later, the weight of three kilograms, and then the weight of a piece of ice-96 kilograms begins.
2, large and small bottles of water 9.7 liters, large bottles of water 0.3 liters, when the ratio of large bottles and small bottles of water is 3:2, the size ratio is 40 _ _ _ 57 bottles of Shui Yuan.
3. If the denominator of a score is divided by 100, the score is "_ _ _ _ _ _".
4. There are two baskets of apples, A and B, weighing 30 kg. From basket B to basket B, there are two baskets of apples weighing 5 kg, and basket B is _ _ _ _ _ _ _ _ _ _.
7. The existing equation of 5, 5, 5, 65438+1October 24th is calculated by addition and subtraction and the bracket _ _ 5 * [5-1/5] = 24 _ _ _. If you use 7, 7, 3, 3, how to shave? ___ [3 3/7] * 7 = 24______。
8. The side length of A is 1 square decimeter, the first one crosses the square area B, and then passes through the rest areas. A, then cross out, the remaining area, then b cross out, the remaining area ... and so on, so that two people can stir up the cubic left _ _ _ _ _ _ _ square decimeter without crossing.
9, Xiaoming red, blue two-color ball 95, red ball and basketball, the difference between the two balls.
1 1, commodity prices go up, and then prices go down. The current price is _ _ _ _ of the original price. A B is less than A B _ _ _ _
12, subtraction formula, the sum of the differences between the minuend, the subtrahend and 50, the difference is less than the minuend, and the subtrahend is _ _.
1 1, A and B are 5:4, A to B are 22.5. Their score ratio is 5:7, which is the original B _____.
13, A and B are two known natural numbers, A is equal to B. If you subtract 3 and B adds 3, these two numbers are equal, then the sum of A and B is _ _ _ _ _ _ _ _ _ _; Water freezes into ice, the volume increases, and ice becomes water, but the volume decreases.
Calculation problem.
( 1),× 140- 1÷(2),(3),(4.3×2.375÷×)×
(4) What is the result after the supplier whose product is 25 divided by 0.375 is removed?
Three application problems.
1, A and B, the weight ratio of rice stored in two granaries is 8:7, and position B has 8 tons. More than 65,438+700,000 tons of rice have been preserved in locations A and B.. Q: How many tons of rice were there in the original position?
2. The speed ratio of A and B is 4:3, and the two cars come from A and B respectively at the same time. On the opposite line, they will meet in 10 minutes. Then the lines are in the same direction (before and after B). How many minutes after Ba catches up?
3. Three friends, B and C, went for an outing together. They lost bread for lunch, so A and B have as much bread for him. B, how about the bread brought by B?
4. Road maintenance. The unmodified length ratio is 1:5, and then 490 meters are repaired. What is the ratio of repaired length to unrepaired length?
5, the school red scarf hydrological station measures the depth of the river, inserts the benchmark of the river, inserts the benchmark in the mud, and the water comes out. When the water level rises 12 cm, the depth shall be taken as the benchmark accurately. What was the original depth of this river?
6. One piece of the cloth flower bought rice, and the other two spent six meters. How long is this cloth to the first meter?
7. The school bought three books, story books, less than 40 science books, 160 art books, and three books with a total population?
8, let A = B = C =, D = E =(BA)÷(C÷D÷E), what is the result?
9. Known as A = 3331÷333335 = 22223÷2227, A and B? Why?
10, how many people took part in the foreign language competition? In some math competitions, the winning number of language is the winner of mathematics. The champion of biathlon is 320, so how many people participate in biathlon?
1 1, a primary school student donated books, and the fifth grade donated books to poor mountainous areas. The donation of 154 is 5 less than that of grade 5 and 6. Q: Did the sixth grade donate a batch of books?