ПОМОГИТЕ ПО МАТЕМАТИКЕ
1.Устный счет:


– 4 + (– 5)
– 8 + (– 5)
9 – (– 6)
– 15 : (– 3)
4 · (– 6)
– 8 + 10
– 16 + 9
– 17 – (– 9)
– 9 + (– 5)
(– 8) · (– 4)
– 42 : 7
17 – 24
12 – 30
– 9 · 6
– 81 : (– 9)
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