Tính
\(\eqalign{ & 6 + 4 = ..... \cr & 4 + 6 = ..... \cr & 10 - 6 = ..... \cr & 10 - 4 = ..... \cr} \) \(\eqalign{& 1 + 9 = ..... \cr & 9 + 1 = ..... \cr & 10 - 1 = ..... \cr & 10 - 9 = ..... \cr}\) \(\eqalign{& 7 + 3 = ..... \cr & 3 + 7 = ..... \cr & 10 - 7 = ..... \cr & 10 - 3 = ..... \cr}\)
\(\eqalign{ & 6 + 4 = 10 \cr & 4 + 6 = 10 \cr & 10 - 6 = 4 \cr & 10 - 4 = 6 \cr}\) \(\eqalign{& 1 + 9 = 10 \cr & 9 + 1 = 10 \cr & 10 - 1 = 9 \cr & 10 - 9 = 1 \cr}\) \(\eqalign{ & 7 + 3 = 10 \cr & 3 + 7 = 10 \cr & 10 - 7 = 3 \cr & 10 - 3 = 7 \cr}\)
-- Mod Toán 2
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