1. Xiaoling bought four pens, each at 1 yuan, and five exercise books, each in 2 yuan. A * * * needs () yuan. When a=0.5 and b= 1.2, a * * * needs () yuan.
Xiao Qiang caught a cold recently, and the doctor asked him to drink no less than 2000ml of water every day. His cup contains at most 250 ml of water, so he should drink at least () glasses of water every day.
3. The number of digits with two decimal places is 3.0, and the maximum number of digits of these two decimal places is ().
4. A number expanded to 100 times is 64, and this number is ().
5, a chair N yuan, the price of a table is 6 times that of a chair, then a set of tables and chairs () yuan.
6. The area of a parallelogram is 32 square centimeters, the base is 4 centimeters, the height is () centimeters, and the area of a triangle with the same height is () square centimeters.
Second, I am the best judge of right and wrong!
1, a number divided by a decimal, the quotient may be a decimal. ( )
2. The equation must be an equation. ( )
3, a number multiplied by 0.8, the product is smaller than the original number. ( )
The area of triangle is half that of parallelogram. ( )
5. When the decimal is divided by the decimal, the quotient must be a decimal. ( )
6. The median and average of a set of data may be equal. ( )
Third, it is easy to choose.
1, 0.795 Keep two decimal places ().
a、0.79 B、0.80 C、0.8
2. The following () is the equation.
a、x+3 B、x+3=7 C、x+9
3. Observe a cuboid in one position, and at most you can see its () at a time.
A, one face B, two faces C and three faces.
4. Triangle and parallelogram have the same area and the same base. The height of triangle is 1.6 decimeter, and the height of parallelogram is () decimeter.
a、 1.6 B、3.2 C、0.8
Fourth, calculation
1, a number written directly.
2.5x 2 = 0.24/0.3 = 0. 108/0.0 1 = 7. 1- 1.7 =
6. 18/0.6 = 0. 12+0.8 = 0.2x 500 = 1.4x 0.5 =
0.6/3 = 0.4x 0.5 = 8. 1/0.8 1 = 1.4/0.4 =
2. Calculate the following questions (simplify them if you can).
60-2.3x 12 50x(0.8+0.4)8.88 x9+8x 1. 1 1
3.05/0.25/4 4.27/0.7x 1.3 18.9- 18.9/ 1.4
3. Solve the equation.
5x-7.8 = 20.2 2.5x-x = 1.8 4x+8x = 120
Fifth, solve the problem.
1 a food factory produces 1645 bags of yuanxiao every week, and each 18 bag is a box. How many cartons do these yuanxiao need?
Mom went to the mall and bought 3 boxes of toothpaste and 2 bags of washing powder. A * * * 30.8 yuan, a bag of washing powder 6.7 yuan. How much is a box of toothpaste?
The circumference of the square flower bed is 4.8 meters. How many square centimeters is the area of this flower bed?
Grandpa is 75 years old, five years older than Xiaoming. How old is Xiaoming this year (equation solving)
Answer: 1. 1，4a+5b 8 2，8 3，3.04 4，0.64 5，7n 6，8 16。
2. 1，√ 2，√ 3，× 4，× 5，× 6，√ 3， 1，B 2，B 3，c。
4.c 4, 1, 50.810.85.410.30.921000.70.210/42, 32.460 88.83.02.
2.5.8 yuan 3, 1.44 4, x= 14.