1. The Forbidden City in Beijing covers an area of about 72 hectares, 8 hectares less than Tiananmen Square. How many hectares does Tiananmen Square cover? Solution: Tiananmen Square covers an area of about X hectares. 2x-8 = 72，2x = 80，x = 40。 Tiananmen Square covers an area of about 40 hectares.
2. There is a triangular flower bed in the garden community, with a bottom of 25 meters and an area of 275 square meters. Find the height of the flower bed. Solution: The height of the garden is x meters. 25x ÷ 2 = 275，25x=550，x = 22。 A: The height of the flower bed is 22 meters.
3. There are swans and red-crowned cranes in Zhalong Nature Reserve *** 1360. The number of swans is only four times that of red-crowned cranes. How many swans are there more than the red-crowned crane? Solution: Suppose there are X red-crowned cranes and 4x swans. X+4x = 1360, 5x = 1360, x = 272,272× (4-1) = 816 (only). A: Swan is 8 16 more than red-crowned crane.
There is a tour group going boating. The tour guide calculated that if there is one more boat, each boat will just take six people. If one boat is reduced, it happens that each boat will take nine people. Q: How many people are there in this tour group? Solution: Set the original ship X. 6 (x+ 1) = 9 (x- 1), 6x+6 = 9x-9, 3x = 15, x = 5,6x (5+1) = 36.
5. Yuxin Primary School has 108 students, among whom the number of boys is 1.4 times that of girls. How many boys and girls are there in the science and technology group? Solution: For every X girls, there are 1.4x boys. According to the meaning of the question, the equation is: X+ 1.4x = 108, X = x=45, 1.4x = 1.4× 45 = 63.
6. There are three times as many people skipping rope as kicking shuttlecock in sports competitions. It is known that kicking shuttlecock is 20 times less than skipping rope. How many people jump rope and kick shuttlecock respectively? Solution: If there are x shuttlecock kickers, there are 3x people skipping rope. According to the meaning of the question, the equations are 3x-x = 20, x = 10, 3x = 3x10 = 30.
7. There are 385 trees planted in two classes of grade five in a school, and the number of trees planted in class five (1) is 1.5 times that of class five (2). How many trees are planted in each class? Solution: If there are 5(2) classes with X individuals planting trees, then there are 5( 1) classes with 1.5x individuals planting trees. According to the meaning of the question, the equation is: X+ 1.5x = 385, X = 154, 1.5x = 65438+.
8. The number of students in the school math group is 0.4 times that of the 65438+ writing group. If four students transfer from the math group to the writing group, the number of students in the two groups will be equal. How many people are there in the writing group and the math group? Solution: If there are X people in the writing group and 1.4x people in the math group, the column equation is: 1.4x-x = 4× 2 and x=20.