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The sixth grade of primary school 12-person teaching edition oral arithmetic problem card 70-73 pages of answers.
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,

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