помогите пожалуйста!!!!!! помогите! 1) 3/4 + (- 5/6 )+ (- 7/9 )+ 11/18 ;
2) 5/14 + (- 10/21 )+ 17/28 + (- 4/7 );
3) - 7/15 + 1 /6 + (- 23/ 45 )+ 11/18 ;)
4) - 5/8 + (- 7/18) + 15/24 + (- 23/36)​
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