Помогите решить примеры.
1) (9 - 2 3/11) + (2 + 1 9/11)
2) 28 2/21 - (14 17/21 + 11 8/21)
1) (9 - 2 3/11) + (2 + 1 9/11)
2) 28 2/21 - (14 17/21 + 11 8/21)
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2.)2 + 1 9/11=3 9/11
3.)6 8/11+3 9/11=10 6/11
2) 1.)14 17/21+11 8/21=26 4/21
2.)28 2/21 - 26 4/21=27 23/21-26 4/21=1 19/21