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2/5 + 1 i 7/15 - 5/20 =?

4/7 + 6/28= ?

4 i 7/9 - 3 i 5/9 =?

4 i 1/6 - 2 i 5/6 =?

2 i 1/3 - 5/6 + 3/24 =?


plisss szybko ​