(full name)
figure
achievement
1. Fill in the blanks (3 points for each blank, ***33 points)
1, if, then
(use "
2. Inequality -2
__;
3, expressed by inequality: the sum of 5 times of x and 3 is greater than 1:
The difference between a and b is nonnegative:
There is a saying on the beverage bottle: the shelf life is
18 months.
If you use x
(unit: month) indicates the shelf life, so the shelf life of drinks can be expressed by the following inequality.
5. Being a
, the value of algebraic expression is greater than1;
6. The solution set of inequality group is
7. The distance from home to school in Yang Yang is 2400 meters. He left home at 8 am and arrived at school between 8: 30 and 8: 40. If x is used to express his speed (in meters per minute), then the range of x is
8. If the rational number satisfies the inequality, please write down the rational number you are familiar with:
9, if about X.
The solution x of equation 2x+a = x+7 is positive, so a
Second, multiple-choice questions (3 points for each small question, *** 18 points)
1, which of the following numbers is not the solution of inequality (
)
Answer, 3
b、4
c、5
d、6
2, m is an arbitrary rational number, then the following inequality must be established (
)
(A)m & gt； 0
(B)m & lt； 0
(3)
(4)
3. As shown in figure 1, the mass of each weight in the right plate of the balance is 1g, so the value range of the mass m(g) of object A can be expressed as follows on the number axis.
4, the positive integer solution of inequality is (
)
a、0. 1.2
b、 1，2
c、 1，2，3
d、0， 1，2，3
5, if the inequality group has a solution, then the value range is
(1)
m
& gt v
(2)
m≥5
(3)
M< five
(4)
m≤8
6. Fang plays on the seesaw with her parents. Their weight is 150kg, and her father is sitting at one end of the seesaw. Xiao Fang, who weighs only half as much as her mother, and her mother are sitting on the other end of the seesaw. At this time, his father's end was still on the ground. Please guess that Xiao Fang's weight should be less than (
)
A.
49 kg
B.
50 kg
C.
24 kg
D.
25 kg
Third, solve the problem: 1, solve the inequality, indicating the solution set on the number axis: (6 points for each question, *** 12 points)
( 1)
(2)。
2. (7 points per question) Solve the inequality group:
(2)
3.(7 points) There are 16 multiple-choice questions in a math exam. Scoring method: 6 points for a correct answer, 2 points for a wrong answer, and 0 point for no answer. A student has an unanswered question, so how many questions must the student answer correctly before his score can exceed 60?
4. (8 points) Known equations about,,.
( 1)
Please use with.
The algebraic expressions of represent the values of and respectively;
(2)
If the values of and are both positive numbers, find the value range of.
5.(8 points) Students of Grade One and Grade Two in a school participate in social practice activities. It was originally planned to rent a number of 48-seat buses, but there were still 24 people without seats.
(1) Assuming that 48 buses X were originally planned to be rented, try to express the total number of students in these two years with an algebraic expression containing X;
(2) It is decided to rent 60 buses, 2 fewer than the original planned 48 buses. One of the 60 buses rented is not full, but this bus has more than 36 buses. Please find out the total number of students in this school in the past two years.
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