(20-а) -6 7 (6 целых 7 восемнадцатых) =3 17 (3 целых 17 восемнадцатых)
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18
18
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(20-а) -6 7 (6 целых 7 восемнадцатых) =3 17 (3 целых 17 восемнадцатых)
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18
18
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7 17
(20-а) - 6 ---- = 3 ----
18 18
7 17
(20-а)= 6 ---- + 3 ----
18 18
4
20-а= 9----
3
4
а=20-9----
3
2
а= 9-----
3
20 - а - 6, 7/18 = 3, 17/18
20 - а = 6, 7/18 + 3, 17/18
20 - а = 10, 1/3
а = 9, 2/3