fill up a vacancy
1, () and 0.75 are reciprocal, and the product of 3/8 and its reciprocal is ().
2. Among the four numbers of 0.6, 2/3, 67% and 0.66, the number of is (), and the smallest number is ().
3.A needs 65,438+05 hours, and B needs 65,438+00 hours. The simplest integer ratio of travel time between A and B is (), and the walking speed ratio between A and B is ().
4. Divide a 3-meter-long iron wire into five sections on average, each section is () of this iron wire, and each section is () meters.
A pile of rice was transported to the disaster area, and three-fifths of it was transported by six cars, and the rest was transported by () cars.
6. On a certain day, the time ratio between day and night in Wuhan is 7: 5, and the night in Wuhan has () hours.
8. 10 In the math class, Xiaolan cut a circular piece of paper with an area of 9.42 square centimeters. You can guess that she should prepare at least () square centimeters of paper.
9, 0.95: 0.4 into the simplest integer ratio is (), the ratio is ().
10, the chemical factory produced 300 bottles of shampoo, and 6 bottles were unqualified. The qualified rate of this batch of shampoo was ().
1 1, 10 tons of peanuts can squeeze out 3.5 tons of peanut oil, and the oil yield of peanuts is (), and it takes () tons of peanuts to squeeze a ton of peanut oil.
12, the radius ratio of two circles is 3: 4, their perimeter ratio is (), and their area ratio is ().
choose
1, cut a rope into two sections, the first section is 29 meters long, and the second section accounts for 49% of the total length, then ().
A. The first paragraph is B, and the second paragraph is C. The two paragraphs are the same length.
2, the number of a gymnastics team increased by 25%, and then decreased by 25%, and now the number is () compared with the original.
A, increase B, decrease C, constant D, uncertainty
3. In the following formula, the calculation result is ().
a、 1 1/ 13÷8/9 B、 1 1/ 13×8/9 C、 1 1/ 13×9/ 10
4. Production of a batch of parts, qualified 100, unqualified 2, unqualified rate ().
A, less than 2% B, equal to 2% C, greater than 2%.
5. Wang keeps 40 white rabbits and gray rabbits, and their number ratio may be ().
a、3: 1 B、5: 1 C、2:5
6. On a rectangular paper with a length of 9cm and a width of 2cm, at most () circles with a radius of 1cm can be cut out.
a、4 B、5 C、9
7. Fresh mushrooms will lose 4/5 of their original quality after drying. There are 30 kilograms of fresh mushrooms. How many kilograms are there after drying? The formula is ()
a、30×( 1-4/5) B、30 ℉( 1-4/5)C、30×4/5
8. The following three figures have equal perimeters and an area of ().
A, equilateral triangle b, square c, circle
9, the following statement is wrong ()
One, a batch of parts 98 qualified, 2 unqualified, the qualified rate is 98%.
B, a book with 100 page, Xiaojun read 20% on the first day, and should start with 2 1 page the next day.
C, a non-zero natural number divided by 25% is equivalent to the number reduced to 1/4.
judge
1, a bag of chocolate weighs 25/ 100 kg, which can be written as 25% kg. ( )
2. According to the mass ratio of sugar to water 1: 19, a syrup was prepared, and the sugar content of this syrup was 5%. ( )
3. The radius of the circle is tripled, the circumference is tripled and the area is tripled. ( )
4. It took Xiaoming 20 minutes, Dad 16 minutes, and the speed ratio between Xiaoming and Dad was 5: 4. ( )
The circumference of a circle must be more than three times its diameter. ( )
6. The ratio of the circumference to the diameter of a circle is π. ( )
7. A rope 1 meter long, cut off 55%, leaving 45% meters. ( )
8. Enlarge the former item of a ratio by three times and reduce the latter item by three times, and the ratio remains unchanged. ( )
9. The height ratio between Xiaoqing and Xiaohua is 5: 6, and Xiaoqing is shorter than Xiaohua. ( )