one

1.x is more than one third.

2.x is greater than or equal to three.

3.x is greater than 7

4.x is less than or equal to minus three tenths.

two

1.a is less than 2.

2.a is greater than 2

3.a equals 2.

three

1.- 1 less than x less than 1

2.-3 ………..-2

3.x is less than minus two thirds.

4.x is less than or equal to 1

four

Solution: No, because five fifths of the inequality group x+3 is greater than 2x+3, and five fifths of x+3 is greater than 1-x, so there is no solution.

five

Solution: Xiaojun's statement is wrong, because A is greater than 2a, so A is less than 0. When a is less than o, a is greater than 2a.

six

I don't know.

seven

Solution: From the meaning of the question, it can be concluded that 12(u-3) is greater than 10(u+3), and the solution is that u is greater than 33. A ...........

eight

Solution: Suppose Lao Zhang bought X kinds of rabbits a year ago.

It can be concluded from the meaning of the question that x+2 is less than or equal to two thirds (2x- 1), and the solution of x is greater than or equal to 8. A ...............

nine

When x is less than or equal to 0, 2x- 1 stands for negative odd number.

ten

Solution: Let three consecutive positive integers be x- 1, x, x+ 1, which can be obtained from the meaning of the question.

X- 1+x+x+ 1 less than 333, and x is less than11. Because x- 1 is a positive integer, x- 1 is greater than 0, and x is greater than 1.

A: There are 109 groups in this positive integer * *, and the largest group is 109, 1 1.

179 all the answers are as follows

one

1 sampling survey

2 sampling survey

3 Comprehensive investigation

4 sampling survey

two

1. Learn about the courses that all students like. Whether it is a comprehensive survey or a sampling survey, the boys in a class are not representative.

2. Not representative, we should conduct a comprehensive survey of residents in a certain area.

3. Not representative, the weekend is the rest day for most consumers. The shopping mall has a large flow of people and the sales volume is also rising. It is a prosperous day for sales, but it does not mean that the whole week is as good as the weekend.

three

A: It cannot be used as an estimate of the average weight of seventh-grade students. There are not many seventh-grade students in a school, so it is best to make a comprehensive investigation. Only 30 boys were surveyed, which was far from enough, so they lost their representativeness.

four

As for the frequency distribution table, do it yourself.

Suggestion: The proportion of students wearing 35, 36 and 37 is relatively large. When buying shoes, buy more.

five

1. Because A: B: C = 2: 7: 3 and there are 180 people in Area A, the number of people in Area B is 7* 180 divided by 2=630, 3* 180 divided by 2=270. *** 1080 people.

2.A 60 degrees B 2 10 degrees C 90 degrees

six

1. Sector chart

2. Histogram of frequency distribution

It's too much to tell.