2)2.7cm less than x less than 13cm.

3)x is greater than or equal to 2.

4)82

5)x= 1，2，3，4

6)0, 1

7)( 1)3x-2 is less than-1

(2)y+ 12

X is less than or equal to 0.

(3)2x is greater than-x.

8)( 1)x is greater than 72

(2)x is greater than or equal to 1 1 1.

9)( 1)-4 less than x less than -2

(2)-0.8 1 less than or equal to x less than -0.76

10)m is greater than or equal to 3.

1 1)-2 less than x less than 1

12) Let Kobayashi's monthly peak electricity consumption be x kWh (kW. H), then 56x+28( 140-x) is less than or equal to 53X 140.

Solve. X is less than or equal to 125.

Give a brief answer

13)m is greater than or equal to 2.

14) There are x students in this class.

Because x is less than 6, x is less than 56.

Because x is a multiple of 2, 4 and 7,

So x=28.

That is, 28 students in this class.

15) Let the quantity of fry A be x tons,

Then the dosage of the second fry is (50-x) tons.

get

9x+4(50-x) is less than or equal to 360,

3x+ 10(50-x) is less than or equal to 290.

30 is less than or equal to x is less than or equal to 32,

That is to say, it should be controlled between 30T and 32T (including 30T and 32T).

(Hands-on, despise piracy)