a) 1, 7 + 8, 3 ;
б) - 2, 8 + (- 4, 7)
B) 28 + (- 14, 5)
г)5+(-9) ;
д)5 7/9 +(- 5/9 );
e) 6 7/15 + (- 8, 3)
є) 4 6/7 +(-2 3/7 );
ж)-117+(-204) ;
3)-8 11/13 +5 2/3
u)-29,78+(-31,52) ;
СРОЧНО​
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