First, it is not difficult to fill in the blanks, and it is not easy to answer correctly. (2 points for each space, *** 12 points)
1. To solve the equation 4.5x+ 1.2 = 10.2, we can first regard () as a whole, and according to the properties of the equation, transform the equation into () on both sides of the equation at the same time, and get x = ().
The TV factory produces X black-and-white TV sets every month, and the number of color TV sets is a of black-and-white TV sets.
Second, two kinds of TV sets produce B sets per month, and color TV sets produce () sets per month. If you want two kinds of TV sets,
How many machines are there in each? The column equation is ().
Second, I am a little judge, and I will judge right and wrong. (5 points)
1, the length of a rectangle is 4 times wider than 2 cm, and the length is 14 cm. If the width is x cm, the equation holds.
That is 4x+2 = 14. ( )
2. The equation 3x-0.5 = 6 can be simplified to 3x = 5.5. ( )
3. the number a is less than 6 times 7 of the number b. If the number b is x, then the number a is 6x+7. ( )
4. The area of a triangle is 6 square centimeters, the height is 2 centimeters, and the bottom is X centimeters. The equation is 2x÷2 =
6。 ( )
5. The number A is 36 more than the number B, and the number A is 3 times that of the number B. Let the number B be x and the equation is 3x-x = 36.
( )
Third, the brain turned around and found all the answers. (2 points for each question, ***6 points)
1, the number of a is a, and the number of b is 8 times 3 of a. Find out the difference between A and B ()
a、a-8a B、8a-a C、8a+3-a D、a-(8 a+3)
2. A package has one kilogram of fruit candy, and B package has one kilogram of fruit candy. If 5 kg of fruit candy is taken out of bag A and put into bag B, the weight of the two bags of fruit candy is equal. According to the meaning, the equation is ()
a、a+b = b-5 B、a-b = 5×2 C 、( a+b)÷2 = 4
3. 10 basket of apples and 6 baskets of pears, weighing 430 kg. If each basket of apples weighs 25 kilograms, how many kilograms does each basket of pears weigh on average? Let each basket of pears weigh x kilograms. According to the meaning, the correct equation is ()
a、25× 10+6x = 430 B、25×6+ 10x = 430 C 、( 25+x)×( 10+6)= 430
Fourth, practice and do some calculations. (3 points for each question, *** 12 points)
x+4x = 464 3x-0. 16 = 8
9.5 x-7. 1 x = 15.38 6.8 x÷4 = 3.9 1
5. find the value of x. (3 points for each question, ***6 points)
1, and the circumference of the rectangle is 2 16 cm.
2、
6. Dad is 8 kilograms lighter than Xiaoming. Dad is known to weigh 72.5 kilograms. What's Xiaoming's weight? (8 points)
7. Two cars, A and B, leave from a station in opposite directions at the same time. Car A travels 80 kilometers per hour and car B travels 60 kilometers per hour. A few hours later, the distance between the two cars was 784 kilometers. (Equation solving) (8 points)
Xiao Qiang and Liang Xiao read the same book. Xiao Qiang reads 12 pages every day, and Liang Xiao reads 8 pages every day. How many days later, Xiao Qiang read 68 pages more than Liang Xiao? (8 points)
The school held a sports meeting and made colorful flags. There should be 240 red and yellow flags. The red flag has five times as many faces as the yellow flag. How many faces should the red flag and the yellow flag have? (8 points)
10. The bus from A to B has a speed of 64 kilometers per hour, and the car from B to A has a speed of 87 kilometers per hour. Two cars come out of two stations at the same time and meet at a distance of 92 kilometers from the midpoint. How many kilometers are the two stations apart? (9 points)
The price of a football is equivalent to the price of three volleyballs. Miss Zhao bought five volleyballs and two footballs and spent 275 yuan. How much is a football and a volleyball? (8 points)
Twelve, move the little brain and draw pictures together. (10)
Draw an isosceles triangle with an area of 5 square centimeters and a base height of 2.5 centimeters.
Thirteen, chickens and rabbits ***84, * * * has 224 feet. How many chickens and rabbits are there? (5 points)
Part of the answer:
1. 1, 4.5x minus1.24.5x =10.2-1.22.
2、ax x+ax = b
Two. 1, √ 2, × 3, × 4, √ 5, √.
Third, 1, C 2, B 3, a
Verb (abbreviation of verb) 1. Solution: (x+40) × 2 = 2 16x = 68.
2. Solution: 6x-x = 75x = 15.
Solution: let Xiao Ming weigh x kilograms.
2x-8 = 72.5 x = 40.25
7. Solution: Suppose the distance between two cars is 784 kilometers after X hours. The equation is not, such as 80x+60x = 784x = 5.6.
8. Solution: Suppose Xiao Qiang read 68 pages more than Liang Xiao after X days.
12x-8 x = 68 x = 17
9. Solution: Set the X surface of the yellow flag and the X surface of the red flag.
x+5x = 240 x = 40 5x = 200
X. Solution: Let's meet for x hours.
87x-64x = 92×2 x = 8
(87+64) × 8 =1208km
Xi。 Solution: We set up an X yuan volleyball and a 3 x yuan football.
5x+2×3x = 275 x = 25 3x = 75
12. Hint: First, find the bottom edge 5×2÷2.5 = 4 (cm). Draw a line segment 4 cm long to find the midpoint. Draw a vertical line at the midpoint and cut it into 2.5 cm to form an isosceles triangle.
Thirteen. Solution: If there are x rabbits, there are (84-x) chickens.
4x+(84-x)×2 = 224 x = 28 84-x = 56