Rational number: 1. The following statement is wrong: () A all rational numbers can be represented by points on the number axis The origin on the b-axis represents the number 0 The point of number - A on the c axis is to the left of the origin D 0 is the dividing point between positive and negative numbers 2. On the number axis, the following statement is incorrect: () A two rational numbers, the absolute value of large far from the origin B two rational numbers, the big one is on the right side of the number axis C two negative rational numbers, the big one is near the origin D two rational numbers, the big one is far from the origin 3. The following statement is correct: () A positive and negative numbers are called rational numbers B integers and fractions are called rational numbers C positive and negative integers are collectively called integers D fractions include fractions and negative decimals 4. The following statement is correct: () ① The absolute values of two opposite numbers are equal ② The absolute value of both positive and zero equals itself ③ Only the absolute value of a negative number is its opposite ④ The opposite absolute value of a number must be negative A. 1 B, 2 C, 3 D, 4 d

Rational number: 1. The following statement is wrong: () A all rational numbers can be represented by points on the number axis The origin on the b-axis represents the number 0 The point of number - A on the c axis is to the left of the origin D 0 is the dividing point between positive and negative numbers 2. On the number axis, the following statement is incorrect: () A two rational numbers, the absolute value of large far from the origin B two rational numbers, the big one is on the right side of the number axis C two negative rational numbers, the big one is near the origin D two rational numbers, the big one is far from the origin 3. The following statement is correct: () A positive and negative numbers are called rational numbers B integers and fractions are called rational numbers C positive and negative integers are collectively called integers D fractions include fractions and negative decimals 4. The following statement is correct: () ① The absolute values of two opposite numbers are equal ② The absolute value of both positive and zero equals itself ③ Only the absolute value of a negative number is its opposite ④ The opposite absolute value of a number must be negative A. 1 B, 2 C, 3 D, 4 d

The following statements are wrong: (c)
A all rational numbers can be represented by points on the number axis
The origin on the b-axis represents the number 0
The point on the c axis that represents the number - A is on the left side of the origin. A0 - A is on the right side of the axis
D 0 is the dividing point between positive and negative numbers
On the number axis, the following statements are incorrect: (d)
A two rational numbers, the absolute value of large far from the origin
B two rational numbers, the big one is on the right side of the number axis
C two negative rational numbers, the big one is near the origin
D two rational numbers, the big one is far away from the origin. Two negative numbers, the big one is near the origin
The following statement is correct: (b)
A positive and negative numbers are called rational numbers. What about 0
B integers and fractions are called rational numbers
C positive integers and negative integers are called integers. What about 0
D fractions include fractions and negative decimals. Decimals are fractions
The following statements are correct: (b)
① The absolute values of two opposite numbers are equal
② The absolute value of both positive and zero is equal to itself
③ Only the absolute value of negative number is its opposite number. The absolute value of wrong 0 is 0, and the opposite number of 0 is 0
④ The opposite number of absolute value of a number must be negative. The opposite number of absolute value of wrong 0 is 0
A. 1 B, 2 C, 3 D, 4 d

The following statement is correct: a · 0 is neither an integer nor a negative number, B the absolute values of two opposite numbers are equal, C. rational numbers are divided into positive and negative numbers, D. if the absolute values of two numbers are equal, then the two numbers are equal, give a positive answer!

The absolute values of two numbers whose B are opposite to each other are equal
After other corrections
A 0 is an integer
B rational numbers are divided into positive and negative numbers and 0
C if the absolute values of two numbers are equal, then the two numbers are equal or opposite

Given that ABC is a rational number not equal to zero, and ABC & gt; 0, find the possible value of a / A + B / B + C

If it's | a | / A + | B | / B + | / C | / C, it can't be found
Because ABC > 0, a, B and C are all positive numbers or two negative numbers and one positive number,
Then | a | / A + | B | / B + | C | / C = 1 + 1 + 1 or 1-1-1,
That is to say, the possible value is 3 or - 1

Through the point P (2.0) to the circle x2 + y2-2y-3 = 0, the tangent line is drawn, and the tangent is obtained
Finding tangent equation

Let the tangent equation be y = K (X-2)
Circle: x ^ 2 + (Y-1) ^ 2 = 4
The distance from the center of circle (0,1) to the straight line d = | - 1-2k | / radical (k ^ 2 + 1) = 2
Square: 1 + 4K + 4K ^ 2 = 4 (k ^ 2 + 1)
K=3/4
The tangent equation is y = 3 / 4 (X-2)
In addition, the line x = 2 is also a tangent of the circle

(1) When a = - 1, - 2, - 3 How does the value of fraction 1 / a change? (2) when a takes what integer, the value of fraction 6 / A is an integer?

(1) When a = - 1, - 2, - 3 The values of fraction 1 / a are - 1, - 1 / 2, - 1 / 3,
(2) When a = ± 1 or a = ± 2 or a = ± 6, the value of fraction 6 / A is an integer?

Given that real numbers x and y satisfy x2 + y2-4x + 1 = 0, find the value range of 2x + y?

2x+y=z
Y = - 2x + Z, Z is a constant
Make the line above tangent to the known circle
To solve the linear equation, there should be two straight lines to meet the requirements
The middle coordinate of the intersection of the line and the y-axis is the value range

What is the quotient of the sum of 4 / 5 and its reciprocal minus the product of 7 / 6 and 4.8?

(4/5+5/4)÷（7/6x4.8）
=(16/20+25/20)÷5.6
=41/20÷28/5
=41/112
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Given x = 1 / (2-change sign 3), y = 1 / (2 + change sign 3), find the square of 5x + XY + 5Y
Given x = 1 / (2 - √ 3), y = 1 / (2 + √ 3), find the value of 5x & sup2; + XY + 5Y & sup2

Easy to get x = 2 + √ 3, y = 2 - √ 3
5x²+xy+5y²
=5(x²+y²)+xy
=5[(2-√3)²+(2+√3)²]+(2+√3)(2-√3)
=5*14+(4-3)
=71.

Given: a > 1, b > 1, C > 1, LGA + LGB = 1, find log (a) (c) + log (b) (c) ≥ 4lgc. Note: log (a) (c) denotes the logarithm of C with a as the base

LGA + LGB = 1ab = 10logac + Logbc = LGC (1 / LGA + 1 / LGB) = LGC [(LGA + LGB) / (LGA * LGB)] = LGC / (LGA * LGB) LGA + LGB = 1 > = 2 √ (LGA * LGB) so 1 / (LGA * LGB) > = 4 if and only if LGA = LGB, then a = b = 5logac + Logbc = LGC / (LGA * LGB) > = 4lgc

If the image of the function y = ax-3 intersects with the image of y = BX + 4 at a point on the x-axis, then a: B equals ()
A. -4:3B. 4:3C. （-3）:（-4）D. 3:（-4）

By substituting y = ax-3 into y = ax-0, we can get ax-3 = 0, x = 3A, that is, the intersection coordinates of the line y = ax-3 and X axis are (3a, 0). By substituting y = 0 into y = BX + 4, we can get BX + 4 = 0, x = - 4B, that is, the intersection coordinates of the line y = BX + 4 and X axis are (- 4B, 0)