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Question and answer on oral calculation of math scores in the first volume of sixth grade.
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2/ 1*2= 1 3/ 1*3= 1 3/2*3=2 3/ 1*6=2

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

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

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

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

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

9/7* 18= 14 25/7* 100=28 9/5*8 1=45 8/9* 16= 18 3/4 + 1/4 = 1, 2 + 4/9 =22/9, 3 - 2/3 =7/3, 3/4 - 1/2= 1/4

1/6 + 1/2 - 1/6 = 1/2, 7.5-(2.5+3.8)= 1.2, 7/8 + 3/8 =5/4

3/ 10 + 1/5 = 1/2, 4/5 - 7/ 10 = 1/ 10, 2 - 1/6 - 1/3 = 1.5

2/ 1*2= 1 3/ 1*3= 1 3/2*3=2 3/ 1*6=2 4/3*8=6 5/3*20= 12 7/3* 14=6 8/7*40=35 4/3* 16= 1 2 9/5* 27= 15 2/ 1*30= 15 12/7*24= 14 30/ 1*30= 1 5 1/9* 102= 18 19/9* 76=36 4/9*8= 18 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 8/ 19* 16=38 6 1/60* 122= 120 7/2*28=8 6/ 1*48=8 9/7* 18= 1 4 25/7* 100=28 9/5*8 1=45 8/9* 16= 18

12÷3/5 = 12×(5/3)9÷6/7 = 9×(7/6)30÷5/6 = 30×(6/5)4×(3/2)= 4÷2/3(4)÷5/7 = 4×7/5 3÷4/5 = 3×5/4(24)÷7/ 16 = 24×( 15

2/ 1*2= 1 3/ 1*3= 1 3/2*3=2 3/ 1*6=2

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

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

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

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

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

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

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