fill (up) a vacancy

1 class and class 6 (1) have x boys, five girls are twice as many as boys, and there are () girls.

In September, TV stations broadcast cartoons m times, which was 1.2 times that of September, () times that of1October, () times that of September and1October, and () times that of September.

3. There are X teachers in the school, and the number of students is 20 times that of teachers, with 20X being () and 20X+X being ().

4. Xiaoying is 1 1 years old, X years younger than Xiaojun, and Xiaojun is () years old three years later.

5.7.8×□-5.8×□ = 10, the equation is established by filling in the same number, and □ should be filled in ().

6. Fill in ">" < or "=" in "0".

(1) When X=50, 2x-3602 (x-36)

(2) When X=5, 4x+3x04+3x.

(3) When X=25, 0.8x ÷ 306.

7. The area of a triangle is 50 square centimeters. If its height is 5 centimeters, then its base is () centimeters.

8. Teacher Wu made a rectangular teaching aid with 60 cm long wire, which was 25 cm long and () cm wide.

9. The two natural numbers adjacent to A are () and (), and their sum is ().

10, Xiaoming bought 8 books, each of which cost X yuan, paid 5 yuan and got back () yuan.

1 1, if a÷b=7 and A+b= 9.6, then a= () and b= (). If m+n = 9 1 and m \n = 8... 1, then m=( )n= ().

Second, judge.

1, because 2=2+2, so a = a+a. ()

2. There are 25 girls in Class 5 (2), 27 times less than boys, so there are more girls than boys in Class 5 (2). ( )

3. The equation must be an equation. ( )

4. Because a×3=3×a, A ÷ 3 = 3 ÷ A .. ()

5. An equation with an unknown number must be an equation. ( )

Third, look at the graphic equation and answer.

Fourth, calculation

1, solve the equation.

( 1)5X-2.7 = 2.8(2)2X+8.5 = 12.5(3)X-0.3X = 14

(4)5X+6X = 12. 1(5)x÷3.6-2.4 = 0.6(6)0.2 1+4X = 0.45

2, column equation solution

(1) Two times a number is 28 times less than four times. Find this number.

② The product of 5 and 9 minus 3 times a number is 2.7. Find this number.

Fifth, use equations to solve application problems.

1. The total length of China postal trunk line is 1.886 million kilometers, which is 47 times longer than the equator of the earth and about 6 million kilometers more. How many kilometers is the equator of the earth?

A piece of cloth is 55 meters long, and 8 sets of adult clothes and 6 sets of children's clothes are made. It is known that every 3.5 meters of cloth is applied to children's clothes, and how many meters is applied to adult clothes?

3. Enclose a rectangle with the length of 120 cm and the length of 1.5 times the width. How long and wide is it?

4. The number of literary books in the book corner of Class 6 (2) is four times that of scientific books, and the number of literary books is 8 1 more than that of scientific books. How many literature books and science books are there respectively?

5. There are 432 poplars and 265438 Metasequoia in Wangzhuang Forest Farm. There are 42 poplars in Wangzhuang Forest Farm and 10 Metasequoia in Liwan Forest Farm.

(1) How many poplars are there in Liwan, Linyang?

How many Metasequoias are there in Linyang, Liwan?

6. Xiaoming and Xiaohua practice running on the 400-meter circular track. They all started from the same point and walked in the same direction. Xiaoming runs 3.5 meters per second and Xiaohua runs 5.5 meters per second. How many seconds passed before they met for the second time?

7. A bookcase, the books on the upper floor are 2.4 times as many as those on the lower floor. If 56 books on the upper floor are moved to the lower floor, the number of books on the two floors is the same. How many books are there on each floor?

8. The price of photo album is 5.5 times that of notebook. Xiaohong bought an album and four notebooks, which cost 47.5 yuan. What is the unit price of photo albums and notebooks?