It is known that: the common part BD of line AB and CD is 1 / 3AB = 1 / 5CD, the distance between the midpoint E and F of line AB and CD is 6cm, and the length of line AB and CD is calculated |_________ |_____ |____ |____ |_______ | A E D B F C

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• 1. As shown in the figure, given that BC = 1 / 3AB = 1 / 4CD, points E and F are the midpoint of AB and CD respectively, and EF = 60cm, calculate the length of AB and CD As shown in Figure a________ E__ C________ B___________ D
• 2. As shown in the figure, points E and F are the midpoint of line segments AC and BC respectively. If EF = 2.5cm, calculate the length of line segment ab
• 3. As shown in the figure, points E and F are the midpoint of line segments AC and BC respectively. If EF = 3cm, then line segment ab=______ Cm
• 4. As shown in the figure, point B is on the line end AC, e and F are the midpoint of AB and BC respectively. If EF is equal to 3cm, find the length of line AC The picture is a --- e --- B --- f --- C
• 5. As shown in the figure, points E and F are the midpoint of line segments AC and BC respectively. If EF = 2.5cm, calculate the length of line segment ab
• 6. Given that the common parts of AB and CD BD = 1 / 3AB = 1 / 7CD, e and F are the midpoint of AB and CD respectively, and the distance of EF is 6cm, find the length of AB and CD
• 7. As shown in the figure, it is known that the line segment ad = 10cm, the line segment AC = BD = 6cm. E and F are the midpoint of the line segments AB and CD respectively, and the length of EF is calculated
• 8. As shown in the figure, it is known that the line segment ad = 10cm, the line segment AC = BD = 6cm. E and F are the midpoint of the line segments AB and CD respectively, and the length of EF is calculated
• 9. As shown in the figure, the common part of line AB and CD is BD, and BD = 1 / 4AB = 1 / 5CD, e and F are the midpoint of AB and CD respectively, EF = 7cm, find the length of AB and CD
• 10. As shown in the figure, it is known that the line segment ad = 6cm, the line segment AC = BD = 4cm, e and F are the midpoint of the line segments AB and CD respectively, and EF is calculated
• 11. If line AB = 10 cm and AC = 2 cm is intercepted on line AB, how many cm is BC?
• 12. Line AB = 10, Cd on line AB, if the length of AC is 1cm longer than 2 times of BC, then AC = cm
• 13. There are four numbers. The first three are in equal proportion sequence, and the last three are in equal difference sequence. The sum of the first and last two numbers is 22, and the sum of the middle two numbers is 5. The four numbers are ()? Just give me an answer No problem-solving process, as long as the answer, I will also list the equation
• 14. 0.8% x-0.25% x = 220, solve the equation
• 15. Solve the equation and check 4x-24 = 2x + 20
• 16. If the equation x □ - 2 (A-1) x - (B + 2) □ = 0 has two equal real roots, then the square of ab It's Square
• 17. Find the available power of 24 points 1 2 5 11 seek 24 points
• 18. If three regular hexahedral dice marked with 1, 2, 3, 4, 5 and 6 are rolled at the same time, and the numbers are a, B and C respectively, what is the probability that a and B. C are exactly the three sides of a right triangle Another question: a school is going to organize teachers and students to watch Beijing ball games. There are three games in different periods of time, two of which are table tennis games and one is badminton games. If you choose any of the two games, what is the probability that the two games are table tennis games
• 19. The three numbers are arranged in the order of equal ratio sequence, the sum of which is 114. These three sequences are the first, the fourth and the 25th items of an arithmetic sequence in the order before. It is proved that B25 = 8b4-7b1
• 20. Solution equation: 25 * 0.36 = 1.5 + 25% X