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If the product of two rational numbers is 1, then the two numbers are reciprocal; the reciprocal of a is expressed as ()
1 / A, or a ^ (- 1), a is not equal to 0
If the product of two rational numbers is --------, then one of them is the reciprocal of the other, which is also called the two rational numbers
If the product of two rational numbers is [1], then one of them is the reciprocal of the other, which is also called the reciprocal of the two rational numbers
Determinant first line 1,2,3,4 second line 2,3,4,1 third line 3,4,1,2 fourth line 4,1,2,3
Is it equal to 160? It's different from the answer!
Step 1: add column 2,3,4 to column 1, put forward the common factor 10 of column 1, and change it into 1 23 41 3 4 11 4 1 21 1 23. Step 2: multiply the first row by - 1 and add it to other rows to get 1 23 40 11 - 30 2 - 2 - 20 - 1 - 1 - 1. Step 3: R3 - 2r1, R4 + R1, get 1 23 40 11 - 300 - 4 400 0 - 4
Simple calculation of 79 × 9 / 78-9 / 78
79×(9/78-9/78)
=9/78×(79-1)
=9/78×78
=9
How to find the limit of (2x-3) ^ 20 * (3x + 2) ^ 30 / (2x + 1) ^ 50 when x tends to infinity?
Numerator and denominator divided by x ^ 50
=lim(2-3/x)^20 *(3+2/x)^30 / (2+1/x)^50
=2^20*3^30/2^50
=3^30/2^30
=(3/2)^30
432÷54+17×54
Solution: 432 △ 54 + 17 × 54
=8×54÷54+17×(50+4)
=8+17×50+17×4
=8+850+68
=850+76
=926
Have a good time
Factorization of 25A square-10a + 1-B square
25A square - 10A + 1-B square
=（5a-1）²-b²
=（5a-b-1）（5a+b-1)
Simple calculation of 65 ^ 2 + 55 ^ 2-110 * 65
65²+55²-110*65
=65²+55²-2*55*65
=(65-55)²
=10²
=100
If y = 2x + B and circle x ^ 2 + y ^ 2 = 4x intersect at a.b2, and OA is perpendicular to ob, find the value of B
O is the coordinate origin
After the circle is simplified, we can get (X-2) ^ 2 + y ^ 2 = 4, and the center of the circle (2,0) passes through the origin
OA vertical ob
Then AB is the diameter
So the line AB passes through the center of the circle (2,0)
That is y = 2x + B over (2,0)
Substituting x = 2, y = 0 into the equation
B = - 4
Solving the equation x + 2x = 45
x=15
RELATED INFORMATIONS
- 1. Two rational numbers whose product is () are reciprocal to each other
- 2. The product of three rational numbers A.B.C is negative, and the sum is positive. Find the opposite number of a in a + the opposite number of B in B + the opposite number of C in C, The process is better, three can die!
- 3. Consider the following statements: ① the sum of 0 plus a rational number equals the rational number; ② the difference of 0 minus a rational number equals the opposite number of the rational number Consider the following statements: ① 0 plus a rational number, the sum of which is equal to the rational number; ② 0 minus a rational number, the difference is equal to the opposite of the rational number; ③ The product of 0 multiplied by a rational number is 0; ④ The quotient of 0 divided by a rational number is 0 The correct saying is () (A) One (b) two (c) three (d) four
- 4. The difference between the two numbers a must be less than the sum of the two numbers b 0 minus any rational number is equal to the opposite of the number
- 5. For a piece of clothing, the merchant sells it at a price of 150% higher than the cost price, and then launches the sales activity of "clearance sale". He sells it at a discount of 70% of the price. As a result, he still earns 150 yuan. What's the cost price of the clothing My friend, I'm sorry I don't have any points
- 6. Given a = 5, find (A-4) / (A & sup2-9) △ 1 / (A-3) * (A & sup2 + 6A + 9) / (A & sup2-8a + 16)
- 7. As shown in the figure, in the cube ABCD - a'b'c'd ', find the cosine value of the dihedral angle a' - bd-a
- 8. What is the range of the function y = 2 radical x + 1 / 2 radical x
- 9. 7 + 4x = 5x-2 to solve the equation
- 10. The problem of sequence limit: "LIM (n →∞) an = a" is a () (A) Sufficient and nonessential condition (b) necessary and nonessential condition (c) necessary condition (d) nonessential and nonessential condition,
- 11. If two non-zero rational numbers are opposite to each other, their reciprocal is also opposite to each other Such as the title
- 12. There is a mistake in the following statement: 1. Any rational number has reciprocal; 2. The product of two reciprocal numbers is 1.3. The sign of two reciprocal numbers is the same Another is that 1 and negative 1 are reciprocal
- 13. Write two rational numbers so that their sum and product are both positive numbers. Please state the sign of two rational numbers
- 14. ≪ & lt; go one step, go another step & gt; & gt; just referring to & quot; me & quot; falling off the cliff at that time?
- 15. Given rational numbers a, B satisfy a + b > 0, B
- 16. The minimum value of a + AB + b-a-2b
- 17. Proof: no matter what rational numbers a, B, C take, A2 + B2 + C2 AB AC BC must be non negative
- 18. How to add a positive number? How to add a negative number? How to add a positive number? How to add a negative number? How to add a positive number? How to add a negative number? How to add a number and zero? Urgent, urgent!
- 19. If a, B and C are non-zero rational numbers and a + B + C = 0, it's a difficult problem to find... How to do it? a. If B and C are non-zero rational numbers and a + B + C = 0, find all possible values of a / | a | + B / | B | + C / | C | + ABC / | ABC | It's so hard. Who can? Teach me quickly,
- 20. If the positions of nonzero rational numbers a and B on the number axis are shown in the figure, then the following conclusions are correct \ -----|----------|--|--------------- 1、a+b>0; 2、a-b>0 A B 0 / 3、ab0 5、(a+b)(a-b)>0 2 3 4 5