The first year of junior high is a question about the group of unary inequalities

The value of a+1 is greater than 2x, the value of b-1 is equal to 2/2 of x, and the value of x can range from greater than -1 to less than 1

驺: zōu1) Ancient horse breeder (also in charge of driving): pawn.

2) 驺虞 a legendary benevolent beast that does not eat living things, also known as "驺武", "驺tooth"; b Ancient officials in charge of birds and beasts.

3) Horseback squires of the ancient nobility: from. Ride.

子: zǐ1) an honorific title for a person in ancient times; Called a teacher or a moral and learned person: Kong. Pre-Qin Zhu.

2) Address to people: male. Wife. 士 (scholars). Boat (boatman). Just.

3) In ancient times, it referred to children, but now it refers specifically to sons: women. Grandchild. Inherit. Brother (junior, young man).

4) Fruits and seeds of plants: vegetables. Melons. True.

5) Animal eggs: fish. Silkworm.

6) Young, small: Chickens. Livestock. City.

7) Small, hard, granular things: elastic (dàn). Chess.

8) Opposite to "mother": gold (interest). Female buckle. tone (consonant).

9) Addressing people: male. Wife. 士 (scholars). Boat (boatman). Just.

10) The first of the earthly branches, the rat: ugly yin mao (metaphor for the orderly level or the order of things).

11) For timing: hours (11 o'clock to 1 o'clock in the evening). Night (late at night).

12) The fourth class of the fifth-class titles of the feudal system: Jue.

13) Attached to nouns, verbs, adjectives, with a noun (read softly): flag. Disorderly. Fat.

14) Individual measure word suffix (read softly): knocked on the door twice.

15) Last name.

<10*（v+3)<12*（v-3)

63 km Empty Regret Rotten Time v>33 km Hour 2Breeding rabbit = x Lao Zhang's poor rabbit = y

Lao Li = zy = x + 2

z=2x-1

y/z<=2/3

That is, x+2<=2 3(2x-1).

4/3)x-x>=2+2/3

1/3x>=8/3

x>=8

3.Let three consecutive positive integers be n-1nn+1

n 2n is a number in between. n-1n

n+1＜333

n 111, so the maximum number of groups is 109 in the first round

There are 111-3+1=109

Group. Counting from 3 to 111 counts a total of 109 numbers.

Let the rent be Y Yuanzhou Liangcha, rent a 42-seat passenger book car x, then you can know from the question to rent a 60-seat passenger car (8-x), from the question can be obtained:

y=320x+460(8-x)=3680-140x...1) From the question, there can be: 42x+60(8-x) 385, and the solution is x because x must be a positive integer, so the slag balance x is desirable

From equation (1), when x=5, y has a minimum value, which is: y=3680-140*5=2980 (yuan).

That is, when renting 5 42-seat buses and 3 60-seat buses, the rent is the least, which is 2980 yuan.

A 42-seater passenger car has been set up for rent.

x, then 60 passenger cars (8 x

car, from the meaning of the title:

42x＋60（8－x）≥385

320x+60（8-x）≤3200

The ruler of the solution:

x is an integer, x

4 or 5 when x 4, the rent is 320 4 460 (8 4) 3120 yuan;

When x 5, the rental is 320 5 460 (8 5) 2980 yuan A: When renting 5 42-seater buses and 3 60-seater coaches, the rental is the least.

1.Analysis, 42 seats * 8 cars = 336 people, less than the total number of people, so you can't use all 42 seats, all use 60 seats * 8 cars, you can't save money, the more 42 cars you use, the more money you save, 2Assumptions:

If you need x 42-seater cars, then: 8-x 60-seater cars are needed.

Since there can be empty seats, the number of people is the most less than 385, get:

42*x+60*(8-x)≥385

The value of x can range from 7 to 1, from large to small.

When x=742*7+60=304, less than 385, the inequality does not hold, when x=6, 42*6+60*2=372, less than 385The inequality does not hold, when x=5, 42*5+60*3=390, greater than 385The inequality is true, and at this time, 42-seater cars are the most used and the rent is the most economical, so renting 5 42-seater cars and 3 60-seater cars is the most cost-effective car rental solution.