four
(5)12x-1x+y (x2–y2+x+y2x), where x=2 and y=3 (6 inches).
22. Solve the following equation: (10 ")
( 1)2(x+ 1)2 x2+x+ 1x-3 = 0(3)xx- 1- 1 = 3(x- 1)(x+2)
23. If Ax-5 +Bx+2 =5x-4.
X2-3x- 10, find the values of a and b (7 ").
five
24. The fractional equation XX-3-2 about X = m2 is known.
X-3 has no solution. Find the value of m. (7 ").
25.(8 points) Group A completed a project by itself as planned. It will take Team B three days longer than expected to finish the project alone. If Team A and Team B work together for two days, the remaining projects will be completed by Team B alone on time. How many days is the stipulated construction period? (8")
six
26. After Guilin 100 Hutong Reconstruction Project was started, two construction teams, Party A and Party B, won an Hutong Reconstruction Project through public bidding. It is known that the time for Team A to complete this project alone is the time for Team B to complete this project alone.
Four times, because team B has other jobs.
Service: First, Team A worked alone for 55 days, and then Team A and Team B worked together for 20 days, completing the renovation project task (11") (1). If it takes X days for Group B to complete the project alone, please fill in the following table according to the meaning of the question.
Name of Construction Team Time for Independent Project Completion (days)
The working efficiency of each team
A engineering team b engineering team
(2) According to the meaning of the question and the information in the above table, list the equations and find out how many days it will take for Team A and Team B to complete this alley reconstruction project alone.
seven
Reference answers: 1, C 2, B 3, D 4, D 5, B 6, A 7, B 8, A 9, 23 10, 2m-3.
1 1、4.8 12、3 13、x2 -y2
14、x=- 1 15 、≦- 16 、-4 17、x=3 18、7 19、2x 20、 1
2 1, (1) Original formula =-4 (2) Original formula =- 1 (3) Original formula = 1 or 2 (4) Original formula = 1 (5) Original formula =3-2.
22 、( 1)x=- 2
5 (2)x=2 (3)x=7 (4)x=- 1
23、A=3 B =2
24. The speeds of bicycles and buses are 12.5 km/h, 37.5km/h 25 and (1) respectively. Fill in 54 x, 45x, x and 1 from left to right and from top to bottom respectively.
x
(2) Answer: It takes 100 days and 80 days for Team A and Team B to complete this hutong reconstruction project alone.