Вычислите, пожалуйста!!!
1) 8/11-20/55)*66/20
2) 72/73*34/65+72/73*39/65
3) 8/9-8/15*5/6
4) 18/7*4/9+15/14
5) 3/5+4/7:5/21
6) (2/3-4/9)*3/8
7) 18/7*(4/9+15/18)
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