4, 10-6 =...?, 24, 31-7=...?, 27, 15+12=..?, 15, 12+3=...?, 31, 10+21=...?, 6, 25-19=...?, 9, 20- 7 - 4=...?, 28, 7 + 13+ 8=...?, 17, 31- 20 + 6= ...?, 22, Din suma numerelor 20 și 10, scade 8..

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