Выполните сложение:
1) 9 + ( -1 1/2 )
2) 8 + ( -2 5/7 )
3) 5 + ( -6 2/3 )
4) -4 2/5 + 3,4
5) -9,75 + 2 3/4
6) -6,5 + 3 1/2
7) 4 1/2 + (-3)
8) 7 2/3 + (-9)
9) 2 4/5 + (-6).
Пожалуйста помогите.​
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