Số?
a)
\(\eqalign{ & 7 + 4 = ..... \cr & 4 + 7 = ..... \cr & 11 - 7 = ..... \cr & 11 - 4 = ..... \cr}\) \(\eqalign{ & 5 + 6 = ..... \cr & 6 + 5 = ..... \cr & 11 - 5 = ..... \cr & 11 - 6 = ..... \cr}\)
\(\eqalign{ & 2 + 9 = ..... \cr & 9 + 2 = ..... \cr & 11 - 2 = ..... \cr & 11 - 9 = ..... \cr} \) \(\eqalign{ & 8 + 3 = ..... \cr & 3 + 8 = ..... \cr & 11 - 8 = ..... \cr & 11 - 3 = ..... \cr}\)
b)
\(\eqalign{ & 11 - 1 - 6 = ..... \cr & 11 - 7 = ..... \cr}\)
\(\eqalign{ & 11 - 1 - 4 = ..... \cr & 11 - 5 = ..... \cr}\)
\(\eqalign{ & 11 - 1 - 1 = ..... \cr & 11 - 2 = ..... \cr} \)
a)
\(\eqalign{ & 7 + 4 = 11 \cr & 4 + 7 = 11 \cr & 11 - 7 = 4 \cr & 11 - 4 = 7 \cr}\) \(\eqalign{ & 5 + 6 = 11 \cr & 6 + 5 = 11 \cr & 11 - 5 = 6 \cr & 11 - 6 = 5 \cr}\)
\(\eqalign{ & 2 + 9 = 11 \cr & 9 + 2 = 11 \cr & 11 - 2 = 9 \cr & 11 - 9 = 2 \cr}\) \(\eqalign{ & 8 + 3 = 11 \cr & 3 + 8 = 11 \cr & 11 - 8 = 3 \cr & 11 - 3 = 8 \cr}\)
b)
\(\eqalign{ & 11 - 1 - 6 = 4 \cr & 11 - 7 = 4 \cr}\)
\(\eqalign{ & 11 - 1 - 4 = 6 \cr & 11 - 5 = 6 \cr} \)
\(\eqalign{ & 11 - 1 - 1 = 9 \cr & 11 - 2 = 9 \cr}\)
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