First, calculate the following questions:

2+7=9

8+2= 10

10+7= 17

6+5= 1 1

8-2=6

10-5=5

3+4-5=2

10-6+3=7

7- 1+8= 14

9-0-9=0

2+ 1=3

4-2=2

5-4= 1

3+4=7

3+2=5

5- 1=4

4- 1=3

5+ 1=6

4+ 1=5

6-3=3

6-2=4

3+2=5

4+2=6

3-3=0

6-4=2

2+2=4

3+3=6

2+7=9

5-4= 1

6-0=6

5-5=0

0+5=5

6-5= 1

1+3=4

Second, fill in the blanks:

(9)- 1=8

8-(2)=6

(6)+3=9

2+(4)=6

(8)-2=6

7-(4)=3

(3)+6=9

7+(3)= 10

( 16)-8=6

10-(3)=7

(4)+6= 10

2+(5)=7

(9)-2=7

14-( 12)=2

(2)+6=8

5+(4)=9

( 12)-3=9

6-(5)= 1

(3)+4=7

4+(3)=7

Third, fill in the blanks through transformation

1 yuan =( 10) angle

10 1 yuan is (10) yuan.

10 angle =( 1) yuan

1 angle =( 10) point

10 1 point =( 1) angle

2 yuan =(20) Angle.