вычислите:
1) 1/7 + 1/5 + 1/3 
2) 7/10 + 2/15 + 11/30 
3) (2/3 + 9/11) *22 
4) 3/5 : (9/10 - 3/5 * 8/9) 
/-дробная черта 
: - разделить
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