Ответ:
Задание 1
2/9+5/9=7/9
17/26-12/26=5/26
Задание 2 3/25+16/25-1/25=19/25-1/25=18/25
3/25+16/25-3/25=19/25-3/25=16/25
3/25+16/25-7/25=19/25-7/25=12/25
Задвние 3
(х+3/11)-7/11=6/11
×+3/11=7/11-6/11
×+3/11=1/11
×=1/11-3/11
×=-2/11
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Ответ:
Задание 1
2/9+5/9=7/9
17/26-12/26=5/26
Задание 2 3/25+16/25-1/25=19/25-1/25=18/25
3/25+16/25-3/25=19/25-3/25=16/25
3/25+16/25-7/25=19/25-7/25=12/25
Задвние 3
(х+3/11)-7/11=6/11
×+3/11=7/11-6/11
×+3/11=1/11
×=1/11-3/11
×=-2/11