7=2+2+2+1
2+2+2+1 => (2+1)+(2+1)+(2+1)+1 => 10
10-7=3(шт.)
Ответ: 3.
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7=2+2+2+1
2+2+2+1 => (2+1)+(2+1)+(2+1)+1 => 10
10-7=3(шт.)
Ответ: 3.