реши:
1) 1/4 + 2/5=

2) 7/8 - 1/2=

3) 3/7 + 1/2=

4) 5/6 - 2/3=

5) 9/15 + 3/20=

6) 7/9 - 2/5=

7) 7/12 + 3/8= ​
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