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a)3 1/3 : 2 2/9 - 4,6=
10/3 : 20/9 - 4,6=
10/3 * 9/20 - 4,6=
1/1 * 3/2 - 4,6=
3/2 - 4,6=
4 6/10 - 1 1/2=
4 6/10 - 1 5/10=
3 1/10
b)4 2/3 + 5,5 * 3 5/11
4 2/3 + 5 5/10 * 3 5/11
4 2/3 + 55/10 * 38/11
4 2/3 + 5/5 * 19/1
4 2/3 + 95/5
4 2/3 + 19
23 2/3
c)(2/3)2 * 1,8 : 1 1/7
4/9 *1,8 : 1 1/7
4/9 * 1 8/10 : 1 1/7
4/9 * 18/10 : 1 1/7
2/1 * 2/5 : 1 1/7
4/5 : 1 1/7
4/5 : 8/7
4/5 * 7/8
1/5 * 7/2
7/10