Fill in the blanks. (20')
1, a number consists of 700 million, 9 million and 7 thousand. This number is (), and the mantissa after omitting ten thousand is () ten thousand.
2. Divide the 3-meter-long iron wire into five sections on average, and it needs to be cut () times, each section is () and () meters long.
3. 12: 20 = (): 2 = ()% =-= () decimal.
4. If the number of A equals the number of B, then the ratio of A to B is ().
5, 8 tons 50 kg = () tons 4.5 hours = () hours () minutes.
The increment of 6.5 tons is () tons, and the increment of 5 tons is () tons.
7. For cylinders and cones with equal volume and bottom area, the ratio of the height of the cylinder to the height of the cone is ().
8. Enlarge the molecule by 3 times, and to keep its size unchanged, add () to the denominator.
9.6 (4) The number of boys in class is the number of girls, and the number of girls accounts for ()% of the class.
10, =c, (c is not 0) When a is constant, b and c are in the proportion of (); When c is constant, a and b are proportional to ().
Second, judge. (5')
1, 3 meters and 1 meter are equal. ………………………………………( )
2. The former term of the ratio is definite, and the latter term is inversely proportional to the ratio. …………………………………( )
3. All even numbers are composite numbers. ………………………………………………( )
4. cuboids and cylinders with equal bottoms and heights have equal volumes. ………………………( )
5. Remove the 0 after the decimal point, and the size of the decimal point remains unchanged. ………………………………( )
Third, choose. (5')
The 29th Olympic Games was held in Beijing in 2008, and there were () days in the first quarter of this year.
a、90 B、9 1 C、92
2, 25 grams of sugar dissolved in 100 grams of water, sugar accounts for () of sugar water.
a、20% B、25% C、 12.5%
3. There is a watch part with a length of 5 mm, the length of the design drawing is 10 cm, and the scale of the drawing is ().
a、 1:20 B、20: 1 C、2: 1
4. the perimeter of part a and part b in the right picture () a.
A is equal to b, and the circumference of a is c, which is incomparable.
5. A=2×2×5 and B=2×3×5. Their greatest common divisor is (). second
a、2 B、 10 C、60
Fourth, calculation.
1, calculated by a simple method. ( 10')
÷[ -( + )] ( - )× 15
1.3-3.79+9.7-6.2 1 8×0.4× 12.5×2.5
2. Solve the equation. (6')
80-4x = 56x+x = 12x+7×30% = 14.7
3. Off-mold calculation. ( 12')
68×35-408÷24 47.5-(0.6+6.4÷0.32)
1 + ÷4- ÷( × )- 1
4. Column calculation. (6')
A number is 4.5 less than 12. What's this number?
What is the quotient of the sum of the sum of their differences?
Fifth, the operation problem. (5')
1. Make the height of the lower trapezoid, and then measure the required 2. Draw a circle with a circumference of 12.56 cm.
The trapezoidal area is calculated from the data of.
Six, only the formula does not count. ( 15')
(1), the original price of a book 12 yuan, is now on sale in 4.8 yuan. At what discount is this book sold?
(2), a batch of parts, master alone for 6 hours to complete, apprentice alone for 10 hours. Now the two are cooperating. How many hours later are there tasks to be done?
(3) The sum of the sides of a cube is 48 cm. How many square centimeters is its surface area?
(4) In May, the computer company planned to assemble 1.200 computers and actually completed 1.500 computers. What is the percentage of overproduction this month?
(5), typesetting a manuscript, if 640 words per page, to 200 pages; If there are 800 words per page,
How many pages can I arrange?
Seven, solve practical problems. ( 16')
1, the garment factory used to make a suit out of 3 meters of cloth, but later adopted a new cutting process, which can save each suit. How many sets of cloth can you make now instead of 9000 sets?
2. Zhang Xin read a popular science book with 120 pages. On the first day, he read 30% books. The next day, he read the rest. How many pages did he read the next day?
3. A salt drying field can dry 3 grams of salt with100g seawater. How many tons of salt can you dry if you put 5000 tons of seawater into a salt pan at a time?
4.A train runs from A to B, and there is 100 km from B ... AB blood.
How many kilometers is the railway between these two places?
Eight. Intellectuals (5+7+8 = 20')
1、( 1+ + + )×( + + + )-( 1+ + + + )×( + + )
=
2. There are 84 students in Class A and Class B, and 57 students in Class A and Class B. Find the number of students in two classes.
3. A highway is 60 kilometers long and is divided into three sections: uphill, flat and downhill. The ratio of the length of each section is 1 :2 :3, and the ratio of time for Uncle Zhang to ride through each section is 3 :4 :5. It is known that his riding speed on a flat road is 25 kilometers per hour. How long did it take him to finish the trip?
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