Ответ:
19) 1. 7/11/12+5/7/9= 12/61/36
2.4/493×12/61/36= 4/493×493/36=1/9
3. 4/5+1/9=41/45
20) 7/8
21) -5,5
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Ответ:
19) 1. 7/11/12+5/7/9= 12/61/36
2.4/493×12/61/36= 4/493×493/36=1/9
3. 4/5+1/9=41/45
20) 7/8
21) -5,5