First, multiple-choice questions (65438+ 00 points for each small question *** 20 points)
1. Two road construction teams jointly built a road. The first team built 36 kilometers of roads in 9 days, while the second team built 6 kilometers on average every day. In the past three days, how many kilometers have the two teams built on average every day? The correct formula is []
A.(36+6)÷(9+3) B.(36+6×3)÷(9+3)
C.(36×9+6×3)÷(9+3) D.(36+6×3)÷2
The sum of two. 3.75 and 1.25 divided by the difference between these two numbers. What is the result []
A.(3.75+ 1.25)÷(3.75- 1.25)
b . 3.75+ 1.25÷3.75- 1.25
C.(3.75- 1.25)÷(3.75+ 1.25)
Fill in the blanks (1 sub-item 1, 8 sub-item 2, *** 9)
1. The operation order of decimal elementary arithmetic is: in the formula without brackets, do it first, then do it; If there are brackets, count them first.
2.182.5-[(3.6+2.64) × 7.5] ÷ 0.8 According to the operating order:
The first step in the calculation,
The second step of calculation,
The third step of calculation,
The fourth step is calculation.
Three, simple calculation problems (8 points)
2.82+5.3×2.82+2.82×3.7
Four. Calculation problem (1-3 6, 4-5 8, * * * 34).
1.x÷8.6=4.05
2.45.54÷x=3.6
3. List the following three formulas into a comprehensive formula and calculate the result.
a . 2.9+ 1.6 b . 3.8×4.5 c . 6 1.56÷ 17. 1
4.2.4×6.2÷6.2×2.4
5.[( 15.6-2.4)×0.8+4.32]÷3.2
V. Application problems (No.65438 +0 item 4 points, 2-3 item 5 points, No.65438 +4 item 05 points, * * * item 29 points)
1. There is a square with a circumference of 12.8 cm. What is its area?
2. There are 4 tons of flour in the canteen of machine tool plant, and it will take 1. 12 tons for 7 days. According to this calculation, how many days can these flours last?
3. There are two trains, A and B, which start from two places 365,438+02.5km apart and meet after 2.5h It is known that the speed of train A is 60km/h, and the speed of train B is how many kilometers/h?
There is a rectangle with a circumference of 32.6 decimeters and a length of 8.5 decimeters. What is its area?