375 Ришите Пожалуста

Question

375
Ришите
Пожалуста

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Answer 1

1) b + (- 6,5) = 0        2) b + 6,5 = 0        3) 6,5 + b = 6,5        4) b + (- 6,5)= - 6,5
    b - 6,5 = 0                  b = - 6,5                6,5 + 0 = 6,5            b - 6,5 = - 6,5
    b = 6,5                                                     b = 0                        0 - 6,5 = - 6,5
                                                                                                     b = 0

Answer 2

1) 6,5
2) -6,5
3) 0
4) 0