Упростите выражение:
а) (a – b) – a + m
б) – (a + b) + a – (– b + k)
в) (51 – a) + (– 72 + a)
г) (х + у) – (х – у)
д) – (b + 2,4) – (4,3 – b) + (b + 4,3)
Срочно нужно плиз!
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