1 1
5
×1 1
6
= 1 + 1·5
× 1 + 1·6
= 6
× 7
= 6·7
5·6
= 42
30
= 7 · 6
5 · 6
= 7
= 1·5 + 2
= 1 2
= 1.
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1 1
5
×1 1
6
= 1 + 1·5
5
× 1 + 1·6
6
= 6
5
× 7
6
= 6·7
5·6
= 42
30
= 7 · 6
5 · 6
= 7
5
= 1·5 + 2
5
= 1 2
5
= 1.