1.- 1/2

2.2

3. 105

4.0

5.(P-xQ)

6. 1/5

7.-23℃

8.7.5

9.4 or 2

10.(3+0.5x)80%= 16.8

1 1.-2

12. Countdown

13.2.56438+0 * 10 to the fifth power.

14 1 or-1

15. No more than 4

Either-or problem

BCA China construction bank

Do three calculation problems by yourself.

Four painting problems

Main View 343 Left View 134

I'll stop here.