2. If the numerator and denominator of the score of 9/7 are added with positive integers A and B respectively; The result is 9/ 13, so what is the minimum value of (a+b)?
Some cards were marked 3, 6, 9, 12, ... and Xin Xin got three cards. Their numbers are adjacent, and the sum of the numbers is 1 17.
What three cards did Xinxin get?
(2) Can you get four cards with adjacent numbers so that the sum of their numbers is 178? If yes, please point out the one with the largest number among the four cards; If not, please modify the conditions appropriately, and then point out the card with the smallest number among the four cards.
1, I don't know
2. The previous one is wrong!
9+a=9 or multiples of 9
A is a positive integer
The minimum multiple of 9 is 18.
So a=9
This molecule has doubled in size.
The denominator has also doubled to 26.
7+b=26
b= 19
So a+b=28.
It seems so. I'm only in grade three.
3.( 1) Let the middle number be x.
(x+3)+x+(x-3)= 1 17
x=39
x+3=4 1
x-3=36
(2) If the smallest number is X, the largest number is x+9.
x+(3+x)+(6+x)+(9+x)
x=40
x+9=49
1. Please expand your imagination, guess what kind of practical question may be from the equation (x/10)+(x+2/15) =1,and write down the answer. It takes 10 days for A to produce a batch of products independently, and 15 days for B. Now, after two days of production by B, A and B are produced at the same time, and the task is completed. How many days did A produce?
Math Competition Tutoring in Senior Two: Equation Problem (2)
Case study:
1, when a value, the equation has a negative solution? (Huanggang, Hubei, 2002/1 1)
2. when a is a value, the root of the equation about x is a positive number? (Huanggang, Hubei, 2003/1 1)
3. It is known that the two roots of the equation about x are,
Also very satisfied. Find the range of m (2003 Taiyuan /III)
4. The univariate quadratic equation about x is known.
(1) proves that one root of this equation is greater than 2 and the other root is less than 2;
(2) For a= 1, 2, 3, …, 2006, the two roots of the corresponding quadratic equation are respectively.
The value. (Hebei in 2004/15)
As we all know, the equation about x has real roots.
(1) Find the range of a;
(2) If the original equation has two real roots, find the value of a .. (200 1 Guangxi /27)
6. Given the equation about X, is there such a value of n that the square of the difference between two real roots of the first equation is equal to an integer root of the second equation? If it exists, find such a value of n; If it does not exist, please explain why. (Hubei in 2000/16)
7. The equation about x is known.
(1) Verification: No matter what the real value of k is, the equation always has real roots;
(2) If the length of one side of the isosceles triangle ABC is a=6, and the lengths of the other two sides B and C are exactly the two roots of this equation, find the perimeter of this triangle. (Hubei, March 2002)
8. Find all positive integers x, y that satisfy the equation.
(2000 Shanghai Science/13)
9. Integers meet the conditions:
Find the minimum value of. (2003 Shanghai Science/14)