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To be flexible, a little bit difficult, but the calculation to calculate the point, as long as the choice and fill in the blanks, the teacher asked me to give a question in the class meeting to the students We have learned that the quadratic equation of one variable, one variable, one variable and one variable can be expressed
One of the following equations is the quadratic equation of one variable with respect to X ()
A． B．
C． D．
2. The coefficients of quadratic term, first term and constant term of the equation are ()
A、 B、 C、 D、
The solution of quadratic equation of one variable is ()
(A) (b) (c) or (d) or
4 given that x = 1 is a root of the equation x2 + bx-2 = 0, then the other root of the equation is ()
A.1 B.2 C.-2 D.-1
If the solution of the equation about is known, then the value of is ()
A.2 B．-2 C． D．-
If the quadratic equation of one variable x2-4x + 3 = 0 is known as X1 and X2, then X1 &; x2 = ()
A. 4 B. 3 C. －4 D. －3
7 If X1 and X2 are two roots of the quadratic equation x2 + 4x + 3 = 0, then the value of X1 + X2 is ()
A．4． B．3． C．－4． D．－3．
When solving the equation by the collocation method, the original equation should be transformed into ()
A． B． C． D．
The root of equation 2x2 + 7x-4 = 0 is ()
A has two unequal real roots, B has two equal real roots, C has no real roots, D cannot be determined
10 given the equation x2-2x = 1, then the root of the equation is ()
A has two equal real roots B has one real root c has two unequal real roots D has no real roots
It is known that the quadratic equation (A-1) x2-2x + 1 = 0 with respect to X has two unequal real roots, then the value range of a is ()
A.a2 C.a
RELATED INFORMATIONS
- 1. Set up equations or equations to solve application problems: both a and B robots are used to carry chemical raw materials. Type a robot carries 30kg more per hour than type B robot. It takes the same time for type a robot to carry 900kg and type B robot to carry 600kg. How much chemical raw materials do the two robots carry per hour?
- 2. In the acute triangle ABC, BC = 12, the area of triangle ABC is 12, the two moving points m and N slide on the sides AB and AC respectively, and Mn ‖ BC, take Mn as the side, make a square mpqn downward, let its length be x, and the area of the common part of square mpqn and triangle ABC is y (Y > 0) (1) Height ad on edge BC in triangle ABC=____ (2) When x=____ PQ just falls on the side BC (3) When PQ is outside the triangle ABC, the function of Y with respect to X is (indicate the value range of x)
- 3. 1. The side length of square ABCD is 16 √ 2, the diagonal lines AC and BD intersect at point O, through o as od1 ⊥ AB at D1, through D1 as D1D2 ⊥ BD at point D2, through D2 as d2d3 ⊥ AB at D3, and so on, where od1 + d2d3 + d4d5 + d6d7 = - cm 2. Place a triangle ruler on the rectangle ABCD with length √ 3 and width 1, and slide on the diagonal at its right angle vertex P. one side of the right angle always passes through point B, and the other side intersects with the extension line of DC at Q, (1) What is the size relationship between the line segment PQ and the line segment Pb when the point q is on the edge DC (2) When the point q is on the extension line of side DC, is the conclusion of (1) still valid (3) When point P slides on line AC, △ PBC becomes an isosceles triangle? If possible, point out all the positions of Q where △ PBC becomes an isosceles triangle. If not, explain why
- 4. Given that the solution of X − 1x + 2 − XX − 1 = m (x + 2) (x − 1) is negative, try to find the value range of M
- 5. Xiao Ming's money to buy a pen is 5 yuan, Xiao Hong's money to buy a pen is 2 yuan, two people buy a pen more than one yuan, how much is a pen?
- 6. There is a batch of goods. One quarter of the goods were transported on the first day, and three fifths on the second day. There are still 90 tons left to be transported. How many tons are there? 2. The road construction team is working on a highway. One quarter of the highway is built on the first day, and the remaining two thirds are built on the second day. It is known that a total of 1200 meters are built in these two days. How many meters is the whole highway?
- 7. （）÷﹙﹚＝﹙﹚÷﹙﹚＝﹙﹚÷﹙﹚＝6
- 8. 1. For a project, team a will do it alone for 15 days, team B will do it alone for 20 days, team a will do it alone for 5 days, and team a and team B will do it together for several days. A total of 4 / 5 of the whole project will be completed? 2. The task of processing a batch of parts directly from one car is completed by the first group in 20 days, and by the second group in 30 days. Now, it is done by the second group for 6 days, and then by the combination of one and two for 3 days. The rest is completed by the first group. How many days will it take? 3. For a pond, it takes 20 hours to operate a single pump, 30 hours to operate B single pump, and 15 hours to operate C single pump?
- 9. There are 140kg flour in two bags a and B. If 12.5% of the flour in bag a is put into bag B, the weight of flour in the two bags will be the same. How many kg flour are there in the two bags? (please list the detailed formula and use the equation to solve it) ≮ if you answer this question within 3 days,
- 10. Mathematics problems (fractional equation) Set up fractional equation to solve the problem: the design speed of Fuzhou Third Ring Road is 80 per hour. It is known that the distance between a and B is 20 km. Xiao Zhang walks along the Third Ring Road at an average speed of 80 per hour, which is 15 minutes shorter than the original speed. Find out Xiao Zhang's original speed. (the distance between a and B is 20 km when taking the original road and the third ring road.)
- 11. Fill in 6.25 2.5 1 () () 0.064 In a hurry
- 12. Fill in the numbers according to the regulations: 1 / 4, 4 / 9, (), 16 / 25, ()
- 13. First find out the rules, then fill in the numbers （1）1,1.1,1.3,1.6,（ ),( ),3.1,( ）.
- 14. Fill in the figures according to the regulations （1）（）,2,3,6,5,10,7,（）； （2）40,20,（）,5； (3) 1,2,4,5,7,8,10,(),().
- 15. 486162,54, (), (), 25,5,10,30120, () () 25200 486,162,54,（）,（）,2 5,5,10,30,120,（）（）25200 Find the law
- 16. Fill in the blanks: 18,9, () 4.5 3.6
- 17. Find the rules, 18, 9, 10, 5, 6, 3, (), (). What do you fill in the brackets? Find the rules, 18, 9, 10, 5, 6, 3, (), (). What do you fill in the brackets?
- 18. 9、18、54、5、10、30、7、()、（）
- 19. 2、6、18、54、（）、（）
- 20. In order to know A2 = 6, A5 = 162 in the equal ratio sequence {an}, find the first n terms and Sn of the sequence {an}