If the equation x □ - 2 (A-1) x - (B + 2) □ = 0 has two equal real roots, then the square of ab It's Square

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• 1. Solve the equation and check 4x-24 = 2x + 20
• 2. 0.8% x-0.25% x = 220, solve the equation
• 3. 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
• 4. Line AB = 10, Cd on line AB, if the length of AC is 1cm longer than 2 times of BC, then AC = cm
• 5. If line AB = 10 cm and AC = 2 cm is intercepted on line AB, how many cm is BC?
• 6. 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
• 7. 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
• 8. 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
• 9. 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
• 10. 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
• 11. Find the available power of 24 points 1 2 5 11 seek 24 points
• 12. 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
• 13. 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
• 14. Solution equation: 25 * 0.36 = 1.5 + 25% X
• 15. 3x (2x-2) = 12, simple equation to calculate, and check calculation Simple equation to calculate, and check! Urgent
• 16. Given that one root of the equation x-6x + m-2m + 5 = 0 is 2, find the other root and the value of M
• 17. 24:00: 3, 2, - 2, 1 (power can be used)
• 18. Roll three regular hexahedral dice marked with 1, 2, 3, 4, 5 and 6 at the same time, and the numbers are a, B and C respectively. Then the probability that a, B and C are exactly the three sides of a right triangle is () A. 16B. 112C. 136D. 536
• 19. The sum of the three numbers is 114. If the three numbers are the first, fourth and 25th items of an arithmetic sequence in the previous order, then the sum of the numbers on each bit of the three numbers is?
• 20. Solving equation 25 × 0.36 = 15 + 25% X