2. Multiply it once to know that it is: 8*8=64? 64*8=5 12? 5 12*8=40964096*8=32768 has been circulating in 4.2.6.8, and it is reduced to 8 after five times, while 20 10 is a multiple of 5, so it is 8.

3. when x; 0, so the absolute value becomes-(x-2) = 2-x.

When 2

When X>3 and the equation is X-2+X-3= 1X=3? So there are two.

4. North by East 60 (North by East is a fixed coordinate system ...)

5. The upper side of the X axis, the right side of the Y axis and the first quadrant are all positive numbers. The distance from the X axis to the Y axis is equal, that is 2X=X+3X=3.

6. by? 999, replace ... with 2 and use the computer. ...

7. Every number added is: 1/32/53/74/9? (In my opinion), the last one is 1005/20 1 1.

8. Countless solutions are X=X (ancient). What is, er ... 3 12? If it is 3/2, that is, a=(-2/5)? Many collocations ..

9. Solve the equation containing A, find out one of them (X or Y), and then according to the algebraic formula >; 0 calculate the range of a> 1

10. Let the cows eat X grass every day, and the grass grows Y every day, for a total of 1. The equation is: 24x-6y =121x-8y =1.

Solve by yourself, each tool, and break the offspring of X and Y into several.

1 1. Let the chicken equation of degree x be 9x+(5+2) * (10-x) = 61.

12. According to my estimation, there are at most six. It is divided into seven parts (as shown in the figure).

In a moment. Do it next time.