1, () is 27; 48 is ().

More than 2.80 meters is () meters; Less than tons is () tons.

3. The product is the reciprocal of two numbers (), and the reciprocal of () is itself.

4、( )∶( )= =9÷( )=

5. The simplest integer ratio of 18: 36 is (), and the ratio of18: 36 is ().

6. "The number of red flowers equals the number of yellow flowers" means that the number of flowers in () is regarded as the unit "1" and the relationship is ().

7. If the ratio of A number to B number is 4∶5, then A number is B number, and B number is the sum of A number and B number. ..

8, the circle is () graphics, it has a () axis of symmetry.

9、 ×( )= ÷( )= +( )= 1

10, 48 cm iron wire is enclosed in a triangle (excluding the joint). The length ratio of the three sides of this triangle is 3: 4: 5, and the longest side is () cm.

Second, discerning right from wrong. (5 points)

1, the diameter is twice the radius. ( )

It takes Xiao Gang 5 minutes and Xiao Ming 7 minutes to walk from school to the cinema. The speed ratio between Xiao Gang and Xiao Ming is 7: 5 ().

There are more pine trees than cypress trees, and the number of cypress trees is less than pine trees. ( )

4. If A: B = 3: 5, then a=3 and b=5. ( )

5. When two fractions are divided, the quotient must be less than the dividend. ( )

Third, sit in the right position. (6 points)

1, the ratio of a ratio is, if the previous item and the latter item are expanded three times at the same time, the ratio at this time is ().

A, B, C,

2.a. d is sitting in the fourth row of the second column in the classroom, which is represented by several pairs of (2,4), and Wang Hua is sitting in the first row of the sixth column, which can be represented by ().

a 、( 1，6 ) B 、( 6 1)C 、( 0，6)

3. The reciprocal of the following groups is ().

A, 0.5 and 2 B, and c, and

4. In the figure below, the symmetry axis is the most ().

A, equilateral triangle b, square c, circle d, rectangle

5, a bag of potatoes, who ate, ate 30 kilograms, this bag of potatoes was originally () kilograms.

a、20 B、50 C、240

6, pi is a ().

A, finite decimal b, infinite acyclic decimal c, cyclic decimal

Fourth, do it. Write the position of the points marked with letters in the picture. (6 points) (

A( 5，9 ) B( ) C( ) D()

E( ) F( ) G()

Fifth, be careful in calculating problems.

1, write directly. (8 points)

× 16= 12÷ = 0.3× = ÷ = 1÷ =

× ÷ = × ÷ × = 0× + =

What can be simplified should be simplified. (15)

48×( + ) 23- × ÷ ×7+ × 1 1

5 ÷ [(+) × ]× 99+x = (solving equation)

Sixth, solve the problem. (38 points)

1, according to the known conditions, connect the problem with the formula with a line.

There are 3200 chickens in the farm, which are sold in the first week and the second week.

How much did you sell in the second week? 3200×

How much did you sell in the first week? 3200×

How much did the second week sell more than the first week? 3200×( 1 - )

How much is it for 3200×-3200× two weeks?

How much is left? 3200×( +)

2. The circumference of the rectangle is 49 meters, and the length-width ratio is 4∶3. What is the area of this rectangle?

3. The radius of the circular pool is 6m. What's its circumference?

A grain store sold 49 tons of rice last week, which sold more rice than flour. How many kilograms of flour did the grain store sell last week?

5. Distribute 300 apples to three classes in kindergarten according to the ratio of 4: 5: 6. How many apples are there in small class, middle class and big class?

6. Xiaoming weighs 36 kilograms. Xiao Ming is lighter than Xiao Ling. What is Xiaoling's weight?