Виконайте дії ( розписати)!!!

1)1,9+(-4,2)=
2) - 4,5+7,1=
3) - 1 1/6+(-2 4/9)=
4) - 10,7 +10,7=
5) 6,4 - (- 3,5)=
6) 2,6-7,2=
7) - 5,5 - (-7)=
8) - 8/15 - 7/20=
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