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2). 8
3). 12
4). 3
2. 6 + 9 - 7 =
3. 7 - 5 + 10 =
4. 11 - 9 + 1 =
5. 20^2 : 10^2 - 3^2 = (400 : 100) - 9 =
6. 64 + 25 - 36 =
7. 13^2 + 10^2 - 3^2 = 169 + 100 - 9 =
8. 8^2 - 4^2 + 7^2 = 64 - 16 + 49 =
isi sendiri yaa