3/7+ 1/9=34/64 1/3- 1/5=2/ 15 1/6+ 1/4=5/ 12 5/7- 1/5= 18/35

2.

1/2+3/8=7/8 5/ 12- 1/4= 1/6

1/ 12+3/8= 1 1/24 9/ 10- 1/4= 13/20

1/24+3/8=5/ 12 5/7- 1/4= 13/28

3.

5/8+ 1/8=3/4 16/24- 10/24= 1/4 5/ 10+2/ 10+ 1/ 10=4/5

5/9- 1/2= 1/ 18 2/3+ 1/4= 1 1/ 12 5/6- 1/3= 1/2

4.

1/4+3/8+3/ 10= 10/40+ 15/40+ 12/40=37/40

1-37/40=3/40

5.

X+3/7=3/4 x-5/ 12=3/8

x+3/7-3/7 = 3/4-3/7 x-5/ 12+5/ 12 = 3/8+5/ 12

x = 2 1/28- 12/28 x = 9/24+ 10/24

x=9/28 x= 19/24

x-5/6= 1

x-5/6+5/6= 1+5/6

x=30/30+25/30

x= 1 1/6

6.4-3 5+2

1/3- 1/4=───── = 1/ 12 1/2+ 1/5=───── =7/ 10

3×4 2×5

7-6 6+5

1/6- 1/7=────= 1/42 1/5+ 1/6=────= 1 1/30

6×7 5×6

8-7 9+8

1/7- 1/8=────= 1/56 1/8+ 1/9=────= 17/72

7×8 8×9

3-2 10+9

1/2- 1/3=──── = 1/6 1/9+ 1/ 10=───= 19/90

2×3 9× 10

7.

Dad and Red One * * *, how much is it?

7/ 10+ 1/20= 14/20+ 1/20= 15/20=3/4

8.

2/3+5/6==9/6 3/4+ 1/2=5/4 1/4+ 1/5= 9/20

9.

The first picture should represent 1/2, and the hour hand should start from 12 and walk half a clock face, and the position it should reach is 6; It can also be considered that there are 12 squares on the clock face. If the hour hand moves one square, it means112 has gone. To pass 1/2 on the clock face, you have to pass 6/ 12 on the clock face, that is, you have passed 6 squares. Similarly, the second picture should show 1/3, the position where the hour hand should arrive is 1, the third picture should show 1/4, and the position where the hour hand should arrive is "6".