X=-3, Y=5, then the answer =- 1.

X=3 and Y=-5, then the answer is = 1.

2, the top ten =0,-1/2,-1/3. ...

The last ten digits = 1/2, 1/3. ...

So finally =0.

3. Equation A is actually X= 1+2M.

Equation b is actually X=3M.

1+2M=6M

Then 1=4M

M= 1/4

4. Simplify:

Original formula: 3M-5=3N

You can know that 3M & gt3N

M> ordinary

5. Write the answer directly: 4,7,9, 1 1.

It can be checked and is correct.

6. The teacher donated X yuan.

X+2X-9000=45000

3X=54000

X= 18000

2X-9000=27000

Teachers donated 1.8 million yuan and students donated 27 million yuan.

7. It is known that two children, Bird, and four adults, Bird, bought tickets in the park, and 35 people used 94 yuan to ask how many children there were.

You can list this equation.

8. 1.6 million *0.03 seconds = 480,000 seconds =333 days.

So there was no thunder for 32 days.