Question

помогите пожалуйста

Answer 1

1)-19
2)9,5
3)18
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Answer 2

1. (-7)+(-9)-(+3) = -7-9-3=-19
2.(+6, 7) -(-1, 3) +(-2, 5) +(+4) = 6,7+1,3-2,5+4=9,5
3. (+13) + (-5,7) - (-11, 2) -(+1/2) =13-5,7+11,2-1/2=18