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Mathematics, 07.04.2021 01:00 randall10

Hello, who can help me with this question and if you can explain each letter to me, a, b, c, please, it would help me a lot. it says:
solve the following operations: a)-3×(4+(-5)×2= b)7×(5×(-2)]= c)4×{(-7)×[(-5)×{(-2)}=

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