(5) X-3 (X-2)>=4 to solve x; X < -7 x < -7

(6) 1/2(x+4)& lt； 2JIDEX & lt0。 . . ① Then (x+2)/2 >; (x+3)/3，x >； 0 simultaneous binomial without solution

4. Set the purchase price to X yuan. According to the meaning of the question, the following two types can be listed.

( 1+0. 1)x= 150 .。 . . ①( 1+0.2)= 150 to solve the answer of125 "x"136; & gt& gt ........................

5. Calculate the total tonnage first, that is, the tonnage of A is 1. 1*30=33 tons, and then divide it by the time of B, that is, 33/20= press the calculator yourself. 33/22=。 . .

Finally, (15+16)/2 =15.5, so it is 4.5 tons more than B.

7. Solve the three questions into the final answer x.>2

8。 Move the project. Solution 3 "x" 5 So, 3, 4, 5.

9. let the book be y and the person be X.

3x+8 = y 5 (x-1)+3 = y autolysis 2.

Let the number of people be X.

3X+8=5(X- 1)+3

Q:

If you work out the sixth question again, I will give you extra points.

Answer:

You can set a dose of x milligrams at a time.

Take it three times, and you can get 60 ≤3 X≤ 120, 20≤ X≤ 40.

The solution can be 60≤4 X≤ 120 to get 15≤ X≤ 30.