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The answer to the math oral card in the second volume of the sixth grade
Note: \ stands for semicolon,/stands for division, 2 1 stands for half, and 5+4 1 = 54 1 stands for 5 4/ 1 (with fraction).

5\6*5=6 5\4*2=5/8 2\ 1*4=2 4 4\5*2=2/5 3\ 1*5=3/5

7\2*6=7/ 12 5\2*6=5/ 12 3\5*2=3/ 10 5\7*2=5/ 14 5\6* 1=5/6

7\9*2=7/ 18 5\4*2=5/8 2\45*0=0 5\6-5\4=5\2 2\ 1+2\ 1= 1

4\5-4\5=0 3\2-3\ 1=3\ 1 5+4\ 1=5 4\ 1 5\ 1+5\ 1=5\2 7/7+7/7=2

2/ 1*2= 1 3/ 1*3= 1 3/2*3=2 3/ 1*6=2 4/3*8=6

4/3*8=6 5/3*20= 12 7/3* 14=6 8/7*40=35 4/3* 16= 12

4/3* 16= 12 9/5*27= 15 2/ 1*30= 15 12/7*24= 14 30/ 1*30= 1

30/ 1*30= 1 5 1/9* 102= 18 19/9*76=36 4/9*8= 18 5/8*90= 144

5/8*90= 144 99/98*99=98 3/ 14*6=28 7/ 1*28=4 10/ 1*90=9

5/3* 105=63 19/7*38= 14 5/ 1*25=5 6/ 1*48=8 7/2*28=8 8/ 19* 16=38

8/ 19* 16=38 6 1/60* 122= 120 7/2*28=8 8/ 19* 16=38 1/ 1*2=2

9/7* 18= 14 25/7* 100=28 9/5*8 1=45 8/9* 16= 18 2/7*2=2/ 14

5\4/2=5\2 5\6/2=5\3 3\2/ 1=3\2 5*5\ 1= 1 5\9/3=5\3

7/ 1*8=56 3/ 1*3= 1 3/2*3=2 3/ 1*6=2 4/3*8=6

4/3*8=6 5/3*20= 12 7/3* 14=6 8/7*40=35 4/3* 16= 12

4/3* 16= 12 9/5*27= 15 2/ 1*30= 15 12/7*24= 14 30/ 1*30= 1

30/ 1*30= 1 5 1/9* 102= 18 19/9*76=36 4/9*8= 18 5/8*90= 144

5/8*90= 144 99/98*99=98 3/ 14*6=28 7/ 1*28=4 5/ 1*25=5

10/ 1*90=9 5/3* 105=63 19/7*38= 14 5/ 1*25=5 8/ 19* 16=38

8/ 19* 16=38 6 1/60* 122= 120 7/2*28=8 6/ 1*48=8 2\ 1*2= 1

9/7* 18= 14 25/7* 100=28 9/5*8 1=45 9/3* 16=48