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2. .... ?
3. 2/7 + 3/9 = 18/63 + 21/63 = 39/63
4. (5/10 + 2/5) - 2/4 = (5/10 + 4/10) - 2/4 = 9/10 - 2/4 = 18/20 - 10/20 = 8/20
5. (3/6 + 2/5) - 2/4 = (1/2 + 2/5) - 2/4 =( 5/10 + 4/10) = 9/10 - 2/4 = 18/20 - 10/20 = 8/20
2. 13/21
maaf cm bisa jwb yang itu aja