The first chapter of mathematics test paper In the rational number test paper of the first chapter of mathematics of the first grade of the people's education press, we need more four mixed operation questions of rational numbers, and we'd better attach the answers, No, it's a test paper

The first chapter of mathematics test paper In the rational number test paper of the first chapter of mathematics of the first grade of the people's education press, we need more four mixed operation questions of rational numbers, and we'd better attach the answers, No, it's a test paper

I have some questions about rational numbers. Let's see! Teaching objectives of mixed operation of rational numbers: 1. To further master the operation rules and operation laws of rational numbers; 2. To enable students to skillfully carry out mixed operation according to the operation order of rational numbers; 3. To cultivate students' operation ability

Given that the point P (2x-y, x + 2Y) is in the second quadrant and the distance to the two coordinate axes is 5, then the point Q (x, y) coordinate is ()
A(5,0) B(-1,3) C(0,0) D(3,1)
Write down the specific method

2X-Y=-5
X + 2Y = 5 simultaneous binary linear equation is solved
X = - 1, y = 3, the answer is B

Calculation: (- 5A + 2b) ^ 2

Complete square formula (a + b) ² = A & #178; + 2Ab + B & #178;,
25a²-20ab+4b²

Calculation: - 6A ^ 2B ^ 2 x 5A ^ 2B

-6a²b²×5a²b
=[(-6)×5]a^(2+2)b^(2+1)
=-30a⁴b³
^Express index

5A + 3 [2b-3 (a-b + 2C) - (B-C)] calculation

5a + 3[2b - 3(a - b + 2c) - (b - c)]
= 5a + 6b - 9(a - b + 2c) - 3(b - c)
= 5a + 6b - 9a + 9b - 18c - 3b + 3c
= -4a + 12b - 15c

What is the solution set of the square of x-3x + 2 greater than or equal to 0

The original formula is equivalent to: (X-2) (x-1) > = 0
That is: x > = 2 or X

The square of x plus x plus 1 is greater than or equal to 0
x2+x+1>=0

x^2+x+1
=x^2+x+1/4+3/4
=(x+1/2)^2+3/4
≥3/4＞0
The solution of 〈 x2 + X + 1 > = 0 is any real number

What is the root of the square of X + 1 / x plus x equal to 0?

+1 and - 1

If the solution of the equation 2x + 3 = 1 / 3-m about X is x = - 2, then the value of 1 / 2 of M-M is a 0 B - 8 and 2 / 3 C - 9 d 9

x=-2
Then - 4 + 3 = 1 / 3-m
m=4/3
So 1 / (M-M squared)
=1/(4/3-16/9)
=-9/4

In the equation (M + n) x = m square - n square, if there is a unique solution, then the relationship between M and N is; if there are countless solutions, then the relationship between M and N is

(m+n)x=m²-n²
(m+n)x=(m-n)(m+n)
If there is a unique solution, then M is not equal to negative n
If there are innumerable solutions, then M is equal to negative n