1) 21/20-7/20=14/20
2) 5/7*14/20=70/140=7/14
3) 16/21*8/7=128/147
4) 7/14+128/147=109/294
Ответ: 109/294
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Answers & Comments
1) 21/20-7/20=14/20
2) 5/7*14/20=70/140=7/14
3) 16/21*8/7=128/147
4) 7/14+128/147=109/294
Ответ: 109/294