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English translation Teach me
Thumb, thumb
Index finger, index finger
Middle finger, middle finger
Ring finger
Pinky (finger) / little finger
If x and Y belong to R and 3x ^ + 2Y ^ = 6, then the maximum and minimum of x ^ + y ^ are respectively
The conditions are as follows
x²/2+y²/3=1
This is an ellipse with the focus on the Y-axis and the major axis 2A = 2 √ 3,
And X & # 178; + Y & # 178; denotes the square of the distance from the point (x, y) on the ellipse to the origin,
Since the endpoint of the major axis is farthest from the origin, the endpoint of the minor axis is closest to the origin,
So the maximum value of X & # 178; + Y & # 178; is a & # 178; = 3, and the minimum value is B & # 178; = 2
7. 19, 37, 61, 91, 127, 169 the regular expression of this column number is?
7、19、37、61、91、127、169
12 18 24 30 36 42
7+6(1+n))*n/2-6
=3n(n+1)+1
2X & # 178; + xy-y & # 178; factorization
2x²+xy-y²
=(2x+y)(x-y)
In order to beautify the environment and carry out mass tree planting activities, a city planted 10 hectares of trees on tree planting day on March 12, 2007. If the annual tree planting area increases by the same percentage as that of the previous year, and 36.4 hectares of trees will be planted in the three years of 2009, what is the average annual tree planting Mu growth percentage compared with that of the previous year?
The result shows that the percentage of average annual tree planting per mu is x, then 10 + 10 (1 + x) + 10 (1 + x) 2 = 36.4. After sorting out, we get 25x2 + 75x-16 = 0, that is, (5x + 16) (5x-1) = 0, and the solution is X1 = - 3.2, X2 = 0.2
If the function f (x) = x ^ 2-alx-1l-1 has and only has two different zeros, then the value range of real number a is________
Let's be more detailed
Let X-1 > 0, at this time, we can expand the sign of absolute value to a quadratic function. Find the root, and get the value range of A
Dad went to the supermarket to buy drinks. There were three boxes in a box, four tins in each box, and two yuan in a tin. How much did dad spend on a box?
3 * 4 * 2 = 24 yuan
How to do part B of new concept English 2A (Youth Edition) exercise book, 32 pages and 34 pages?
The answers are as follows:
P32 B
2.were They were at a friend's house
3.was He was at his desk
4.was He was at a party
5.were They were in Scotland last weekend
6.was He was in the country last weekend
7.were They were at a meeting
8.were They were at an exhibition
P34 B
2 were 3 in London 4.were 5 in hospital 6 were 7 at a meeting 8 were 9 i was at my desk
If you have any questions, ask me! I'll teach you the new concept of Youth Edition
These involve the general past tense. Just do more
The truck is 84km in front of the car. The speed of the car and the truck is 80km / h and 56km / h respectively. The car can catch up with the truck in a few hours,
84 / (80-56) = 3.5 takes three and a half hours
AB is the opposite number, CD is the reciprocal, the absolute value of M is equal to 3, then (a + b) the 100th power of power 2008-c × d the 100th power of power + 2m =?
mathematical problem
According to the meaning of the title:
a+b=0
c*d=1
|m|=3
So,
(a+b)^2008-c^100*d^100+2m^2
=0-(c*d)^100+2*3^2
=0-1+18
=17
RELATED INFORMATIONS
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- 2. The two passenger and freight cars leave each other at the same time from a and B, and meet at a distance of 3km from the midpoint. The speed of the bus is 9 / 10 of that of the truck. How many kilometers are there between a and B?
- 3. It took 9 hours for the car to go from a to B and then return to A. It took 100 kilometers per hour to go and 80 kilometers per hour to return. The distance between the two places was? 1000 km
- 4. X1, 2x... X2011 are all positive numbers, a = (x1 + x2... + x2010) (x2 + X3... + x2011) B = (x1 + x2... + x2011) (x2 + X3... + x2010) Compare the size of a and B
- 5. (x + 4) absolute value + (x + 3) absolute value + (x + 1) absolute value + (x-1) absolute value + (x-3) absolute value has a minimum? What is the minimum?
- 6. If the equation (x-1) sin has four different roots x1, X2, X3 and X4 on (- 1,3), then the four roots are added If the equation (x-1) sin has four different roots x1, X2, X3 and X4 on (- 1,3), then what is the sum of the four roots?
- 7. Let X1 and X2 be two of the equations x ^ 2-2008x-1 = 0, and find (x2) ^ 2 + 2008 / x1
- 8. Write two products and sum of 2008x & # 178; - 2007x-2009 = 0, x1 × x2_____ ,x1+x2_______ Let two of the equations 15x & # 178; + 20x-9 = 0 be X1, X2, then X1 & # 178; + x2 & # 178=_______
- 9. Binary linear equation X1 + x2 + X3 +. + x2004 + x2005 = 2005 X1 + x2 = x2 + X3 = X3 + X4 =. = x2004 + x2005 = 1
- 10. Given x2 + X +! = 0, find the value of 1 + X + x2 + X3 + X4. + x2006
- 11. On the number axis, points a and B represent rational numbers a and B respectively. The origin is just the midpoint of AB, a / 2012b=
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- 14. The voltage of a section of resistor is 4V, and the current passing through it is 0.2A. With the last resistor, the current in the trunk increases by 0.4A. Ask r sum r?
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- 18. What is the value range of X that makes the formula √ - 2x + 3 meaningful? Please hurry`` Is the root of the root number``
- 19. The bottom of a parallelogram is 7.8cm, the height is 4.5cm, and its area is (), which is equal to its bottom The base of a parallelogram is 7.8cm, the height is 4.5cm, its area is (), and the triangle area with the same base and height is ()
- 20. As shown in the figure, AB is the diameter of ⊙ o, extend AB to point P so that ab = 2bp, make a tangent line of ⊙ o through point P, the tangent point is C, connect AC, then ∠ cap=______ ．