1.7×0.3 means () to find 7.

2. 0. 409 100 times the expansion is ().

3. When calculating 16.58÷0.24, the decimal points of dividend and divisor should be moved to ().

4.4.8484 ... is a cyclic decimal (). Simply write it as (), and keep two decimal places as ().

5. It is known that the product of two factors is 0.006, one of which is 0.003 and the other is ().

6. 12.496 is accurate to about one percent (), and the reserved integer is about ().

7.0.28×0.98=0.28× 1-0.28×()

8. The base of the parallelogram is 8.5 decimeters, the height is 4 decimeters, and the area of the triangle with the same height as the base is () square meters.

9. The length of the father's step is 75 cm, and the length of the son's step is 60 cm. The son takes 10 step, and the father only needs to take () step.

10. The number A is 2 more than the number B, and the sum of the number A and the number B is ().

12. Given 4x+3 = 9, then 4x-3 = ()

2. judge. (Tick √ for the right and × for the wrong)

1. Move the decimal point of a decimal by one place, and the book will be enlarged by 10 times. ()

2.8.4÷2.5+8.4÷7.5=8.4÷(2.5+7.5) ()

3.3x = 0 is an equation. ()

4.a2=2a()

Three. choose

1.03 divided by 3.8, the quotient is 12, and the remainder ().

A.2 B.0.2 C.0.02

2.32.75×0. 125=32.75×()÷8

a . 10 b . 1 c . 0. 1d . 0.0 1

3. The product of 1 4.5 times 8 minus the quotient of1divided by 0.25, and the formula for finding the difference is ().

a . 14.5×8- 1÷0.25 b .( 14.5×8- 1)÷0.25 c . 14.5×(8- 1÷0.25)d . 14.5×(8- 1)÷0.25

4.7.5×0.6÷7.5×0.6=()

a . 0 b . 1 c . 0.36d . 3.6

4. Solve the equation.

0.8X+7.2=32.8

18.2X+9.3X= 14.025

5. Calculate the following items and use a simple method.

9.24+2.85+2.35× 1.5

12.57-4.464÷0.93-5.2

Presentation of written narrative of intransitive verbs.

1. 1.2 times the product of the difference between 3.4 and 1.9 divided by 0.36. What is the quotient?

3 times of a number minus the product of 6 and 8, the difference is 72. How did you find this number? (Equation solving)

7. Application questions.

1. There are 220 peach trees in the orchard, 28 of which are more than twice as many as plum trees. How many plum trees are there in the orchard? (Solve by arithmetic first, then by equation)

2. The binding team plans to bind a batch of books, 255 books per hour, 10 hour. If 45 more books are bound per hour than planned, how many hours can they be bound?