Urgent Elementary 2 Real Number Calculation Questions, 20 points 35

Won't you go out yourself?

It is known that x, y are both real numbers, and y = (2x-3) + 3-2x) + 4, find the value of xy.

Solution: Since the number of square of the quadratic radical must be non-negative, 2x-3 is equal to 0, i.e., 2x is equal to 3, and 3-2x is equal to 0, i.e., 3 is equal to 2x, so 2x=3, so x=, y=4, so xy=4*

Real number unit test questions.

Fill-in-the-blank questions: (There are 10 questions in this question, each question is worth 2 points, a total of 20 points).

1. The arithmetic square root of is

The square root is

Simplification 5, if m and n are opposite to each other, then

6. If 0, then m n

7. If , then a 0.

8. The opposite of 8 is

10. There are integers whose absolute value is less than

1. Multiple choice questions: (There are 10 questions in this question, each question is worth 3 points, a total of 30 points).

11. Algebraic formula, in which there must be a positive number ( ).

A, 1 B, 2 C, 3 D, 4.

12. If it makes sense, then the range of the value of x is ( ).

a、x＞ b、x≥ c、x＞ d、x≥

13. If x,y are both real numbers, and , then the value of xy ( ).

a, 0 b, c, 2 d, uncertain.

14. Among the following statements, the wrong one is ( ).

The arithmetic square root of a, 4 is 2, and the square root of b is 3

c, the cube root of 8 is 2 d, and the real number with the cube root equal to 1 is 1

The cube root of is ( ).

a、±4 b、4 c、－4 d、16

16. If it is known, the value of is ( ).

a、 b、－ c、 d、

17. The calculated value of is ( ).

a、1 b、±1 c、2 d、7

18. There is a number where the opposite of the number, the square root, and the cube root are equal to itself, and this number is ( ).

a、－1 b、1 c、0 d、±1

19. Of the following propositions, the correct one is ( ).

a. Irrational numbers include positive irrational numbers, 0 and negative irrational numbers b. Irrational numbers are not real numbers.

c. An irrational number is a number with a root sign d. An irrational number is an infinite non-cyclic decimal.

20. Of the following propositions, the correct one is ( ).

a, the sum of two irrational numbers is an irrational number b, the product of two irrational numbers is a real number.

c. An irrational number is an inexhaustible number d. The quotient of two rational numbers may be an irrational number.

3. Answer questions: (There are 6 questions in this question, each question is 5 points, a total of 30 points).

21. Find the square root and the arithmetic square root. 22. The calculated value of .

23. Solve the equation x 8 0.

24. If , find the value of .

25. Calculation.

26. If , find the value of 3x y.

4. Comprehensive application: (There are 10 questions in this question, 2 points for each question, a total of 20 points).

27. If a, b, and c satisfy , find the value of the algebraic formula.

28. Known, find the cube root of 7(x y) 20.

Real number unit test questions, 2 7, 8, 9, 2, 2 10, 3, ,, 2, 1, 0 11---20, adccb cdcdb

You don't even bother to post the title.

1+1=？（2）

And so on, the easiest.

A hundred? It's too much, or you give me the email address and I'll send it to you.

Adopt it, send it to you, and bring it to the mailbox.

Original = (3 2 5-2 3) 1 2 3 Rational simplification.

3 2 5-2 3) 2 3 3 divided by a number is equal to multiplying its reciprocal.

15-4 Multiplicative distribution ratio.

From [(3 5) 2- 12)] 3 2) = (3 5-2 12) ( 3).

Is 3 2 5 3 times 5 times 5 in half? I think it should be expressed as (3 5) 2, and similarly 1 2 3 should be: 3 2

Solution: 8-5 32-3-5

2. 40-2 tenths + 90

Can you read it? 2 8 is simplified to 2 (2*4) and 4 can be taken out, that is, 2*2 2=4 2

In the same way, this kind of problem is simplified first, and the number in the radical is simplified, as for how to simplify, it depends on how many times the root is opened, and the square number inside is taken out first when the root is opened 2 times, and the cubic number is taken out first when the root is opened 3 times.